Halakhah for Berakhot 62:8

To not lend with interest to an Israelite: To not lend with interest to an Israelite, as it is written (Leviticus 25:37), "You shall not give your money with interest, nor should you give your sustenance with increase." And these are not two prohibitions - as increase is interest, and interest is increase; and as they, may their memory be blessed, said in [Bava] Metzia, "You will not find interest without increase or increase without interest. So why did the verse divide them?" [That is] meaning to say, why did it divide them and not write, "Give neither your money nor your food with interest." "To cause the transgression of two prohibitions" - meaning to say, to give multiple warnings about it (Bava Metzia 61a). And this matter is what I have said above (Sefer HaChinukh 336), that the Torah will occasionally repeat warnings about that which it wanted to distance us from greatly. And it is possible for us to say about this, similar to what they, may their memory be blessed, said about other matters, "The Torah speaks like the language of man" (Berakhot 31b). And likewise, the Torah is constantly warning about that which requires our vigilance in the way that people will repeat their conditions and speak much when they warn one another about a weighty matter - so that the [listener] be aware and vigilant about it in all circumstances. And even though it is fitting that a person should be most careful about the word of God - even if he heard the word through the slightest hint - this is all from His great kindnesses upon His creatures, that in a few places He repeated warnings for them many times - like a parent disciplines his child. And we should therefore thank Him for all the goodness that He, blessed be He, bestowed upon us.