(26:3) If you follow My laws and are careful to keep My commandments …
If you follow My laws In the verse, “If you follow My laws, ” the word if is used in the sense of a plea, that is, “if only you would follow My laws, ” as in the verse, “If only My people would listen to Me … then I would subdue their enemies at once” (Psalms 81:14, 15), or as in the verse, “If only you would heed My commands! Then your prosperity would flow like a river” (Isaiah 48:18) (Avodah Zarah 5a).
(26:4) I will provide your rains at the right time, so that the land will bear its crops, and the trees of the field will provide fruit.
I will provide your rains at the right time It says “your rains” and not the rains of all the other countries. There will be abundance in the Land of Israel and hunger in all the other countries, so that they will come and buy grain and produce from you, bringing you prosperity (Torat Kohanim).