Ibn Ezra on Exodus 16:4/אבן עזרא על שמות ט״ז:ד׳

1BEHOLD, I WILL CAUSE TO RAIN BREAD FROM HEAVEN. The bread will come down like rain from the sky.

2[BREAD.] The word lechem (bread) means food. It is found used for bread itself and also for meat, as in lechem isheh (food of the offering made by fire) (Lev. 3:11). It is also used for fruit, as in Let us destroy the tree with the fruit thereof (be-lachmo) (Jer. 11:19).

3[THAT I MAY PROVE THEM.] For they will daily need Me.