“And she gave birth to her firstborn son and wrapped him in swaddling cloths and laid him in a manger, because there was no place for them in the inn.” (Luke 2:7)

This time of year, the words roll right off the tongue. And every child’s first question is: What is a manger? When the teacher explains that it is a feeding trough for animals, the astute youth then wonders: Why was the baby laid there?

Now enters the ancient and hallowed tradition of Nativity speculation. Since we’re supposed to reflect on this narrative for a few weeks each year, we need some way to fill in the gaps left by the gospel narrators. And so we wax eloquent about Mary and Joseph’s poverty. Or the pathetic rejection they faced by the innkeeper. Or the influx of tourism to Bethlehem on account of the census. Or the astonishing degradation to which the Son of God submitted himself in setting aside, for a time, his heavenly glory in order to clothe himself in earthly humiliation—all to win a people for himself.

And every one of these speculations might be true. But in connecting such historical and theological dots, let’s please be careful not to neglect the main reason Luke gives for including this detail in his narrative.

Luke’s Purpose

If we read Luke like a book and not simply as a Christmas photo shoot, we’ll realize that we’re only in chapter 2. It was not all that long ago in the book that Luke made his purpose quite clear and explicit:

“…it seemed good to me also, having followed all things closely for some time past, to write an orderly account for you, most excellent Theophilus, that you may have certainty concerning the things you have been taught.” (Luke 1:3-4)

Luke writes an orderly account of the early Christian movement, so the Roman official Theophilus can be certain about the things he’s heard about it. This is Luke’s purpose: to provide enough evidence to enable Theophilus to be sure about what he’s heard.

But what is it that Theophilus has heard, of which he ought to be certain? The main point of Luke’s gospel is something along the lines of: “The hope of Israel, God’s plan of salvation for the world, has arrived in Jesus.” (You can find my case for this main point here.) It is on account of this hope that Paul is on trial (Acts 26:6-7), and the facts surrounding this hope ought to lead, Luke believes, to Paul’s exoneration before Caesar from the charges brought against him by the Jews (Acts 24:5-6).

So Luke wants his reader to be certain about this hope, with the aim of exonerating Paul from all charges.

The Manger

Now how does this overall purpose help us to understand why Mary laid Jesus in a manger? I confess it will not be all that helpful in understanding why this woman laid her baby in the manger (we’ll need to employ our venerable Nativity speculation to close that gap). But it will help us in every way to understand why Luke saw fit to tell us she had done so.

Just follow the manger through the passage:

• The narrator declares: “And she gave birth to her firstborn son and wrapped him in swaddling cloths and laid him in a manger” (Luke 2:7).
• The angel proclaims: “And this will be a sign for you: you will find a baby wrapped in swaddling cloths and lying in a manger” (Luke 2:12).
• Finally, the narrator recounts: “And they went with haste and found Mary and Joseph, and the baby lying in a manger (Luke 2:16).

Do you see the flow of thought? Mary lays him there. The angel tells the shepherds they will know they have the right baby when they see him lying there. Then they go to see for themselves, and yes, they find him there, just as they had been told.

So can the shepherds be certain of the things they were taught? Can they be sure that this is the right child?

“And the shepherds returned, glorifying and praising God for all they had heard and seen, as it had been told them.” (Luke 2:20)

Conclusion

Luke’s reason for mentioning the manger is that it provided for the shepherds corroboration of what the angel said. The detail of the manger serves a clear narrative and persuasive purpose to show the fact (the baby was laid there), the prediction (the angel said they’d find him there), and the testimony (they did in fact find him there, just as they were told).

So why was the baby Jesus laid in a manger? In Luke’s narrative world, it was so that Theophilus (and by extension, you and I) could be certain that these shepherds were eyewitnesses to the birth. They are among the many eyewitnesses from the beginning (Luke 1:2) whom Luke has researched and included in his account to promote certainty. And just as they could be certain, from the sign of the manger, that they had located the right baby, so also you and I can be certain of the same.

And what is it, precisely, of which they and we can be certain regarding him? What is the hope of which they can be certain?

“For unto you is born this day in the city of David a Savior, who is Christ the Lord.” (Luke 2:11)

This child is the one. He is the one to rescue us (Savior). He is the Messiah, the Chosen One (Christ). He is Yahweh (the Lord) in the flesh.

This advent season, let us, too, “go over to Bethlehem and see this thing that has happened, which the Lord has made known to us.” And may we, too, return, “glorifying and praising God for all [we have] heard and seen, as it [has] been told [us].”