נָת֤וֹן תִּתֵּן֙ ל֔וֹ וְלֹא־יֵרַ֥ע לְבָבְךָ֖ בְּתִתְּךָ֣ ל֑וֹ כִּ֞י בִּגְלַ֣ל ׀ הַדָּבָ֣ר הַזֶּ֗ה יְבָרֶכְךָ֙ יְהוָ֣ה אֱלֹהֶ֔יךָ בְּכָֽל־מַעֲשֶׂ֔ךָ וּבְכֹ֖ל מִשְׁלַ֥ח יָדֶֽךָ׃
너는 반드시 그에게 구제할 것이요 구제할 때에는 아끼는 마음을 품지 말 것이시라 이로 인하여 네 하나님 여호와께서 네 범사와 네 손으로 하는바에 네게 복을 주시리라
Rashi
נתן תתן לו THOU SHALT SURELY GIVE HIM — even hundred times (Sifrei Devarim 117:6).
Chizkuni
ולא ירע לבבך בתתך לו, “not only are you not to refuse a loan but you must not extend a loan reluctantly;” the Torah warns you not to think that you will suffer economic hardship for having been goodhearted. G-d promises that He will bless you for your good heartedness.
Ibn Ezra
on account of [literally: “in rolling over”] i.e., “for the reason of” [literally: “in turning over”]. Compare “to turn this matter the other way” [II Samuel 14: 20]. The reason behind this verse’s assertion is that all of our individual bodies are nothing more than parts of an integrated Whole.