John Gill Commentary Genesis 32:18

"then thou shalt say [They are] thy servant Jacob`s; it is a present sent unto my lord Esau: and, behold, he also is behind us." — Genesis 32:18 (ASV)

Then you shall say, [they are] your servant Jacob's. Both the goats before them, and they themselves that had the care of them, belonged to Jacob, who directed them to speak of him to Esau as his "servant".

it [is] a present sent to my lord Esau; which is the answer to the second question.

and behold also he [is] behind us: that is, Jacob. This they were told to tell, lest he should think that Jacob was afraid of him, and was gone another way; but that he was coming to pay a visit to him, and might expect shortly to see him, which would prepare his mind how to behave towards him.