Albert Barnes Commentary Exodus 2:24

"And God heard their groaning, and God remembered his covenant with Abraham, with Isaac, and with Jacob." — Exodus 2:24 (ASV)

Remembered - This means that God was moved by their prayers to give effect to the covenant, of which an essential condition was the faith and contrition involved in the act of supplication. The whole history of Israel is foreshadowed in these words: God heard, remembered, looked upon, and knew them. It evidently indicates the beginning of a crisis marked by a personal intervention of God.