Luke 2:8

The same country - Round about Bethlehem.

Shepherds - Men who tended flocks of sheep.

Abiding in the field - Remaining out of doors, under the open sky, with their flocks. This was commonly done. The climate was mild, and, to keep their flocks from straying, they spent the night with them. It is also a fact that the Jews sent out their flocks into the mountainous and desert regions during the summer months, and took them up in the latter part of October or the first of November, when the cold weather commenced. While away in these deserts and mountainous regions, it was proper that there should be someone to attend them to keep them from straying, and from the ravages of wolves and other wild beasts. It is probable from this that our Saviour was born before the 25th of December, or before what we call “Christmas.” At that time it is cold, and especially in the high and mountainous regions about Bethlehem. But the exact time of his birth is unknown; there is no way to ascertain it. By different learned men it has been fixed at each month in the year. Nor is it of consequence to “know” the time; if it were, God would have preserved the record of it. Matters of moment are clearly revealed; those which “he” regards as of no importance are concealed.

Keeping watch ... - More literally, “tending their flocks “by turns” through the night watches.”