John Gill Commentary Deuteronomy 15:8

"but thou shalt surely open thy hand unto him, and shalt surely lend him sufficient for his need [in that] which he wanteth." — Deuteronomy 15:8 (ASV)

But thou shalt open thine hand wide unto him
And give him bountifully and liberally; in order to which the heart must be first opened, the affections moved, and a willing mind disposed to give generously:

and shalt surely lend him sufficient for his need in that which he
wanteth :
enough to answer his present exigencies, but not to cause him to abound, or to supply him with things needless and superfluous.