Thrice in the year shall all your men children
appear
before the Lord God
At the three above mentioned feasts, (See Gill on Exodus
23:17) here it is added,
the God of Israel;
who had chosen them to be his special people, had redeemed them
out of Egypt, and done great things for them since; had made a
covenant with them, and had now renewed that covenant with them,
and was their covenant God, and they his people, and so were
under great obligations to present themselves unto him at the
times appointed by him.