Numbers 21:16 - Coke's Commentary on the Holy Bible

And from thence they went to Beer— Or, as the context explains it, to the well which, by God's direction, they dug, and from whence they were supplied with water in their necessity. Grateful for which, they sung the alternate song of praise mentioned in the next verse; where what we translate, Sing ye unto it, is more properly rendered in the margin, answer ye unto it; for the ancient manner was to sing their songs of praise alternately, as appears from Exodus 15:20-21. So the singing women answered one to another, 1 Samuel 18:7.