John Gill Commentary Deuteronomy 14:29

"and the Levite, because he hath no portion nor inheritance with thee, and the sojourner, and the fatherless, and the widow, that are within thy gates, shall come, and shall eat and be satisfied; that Jehovah thy God may bless thee in all the work of thy hand which thou doest." — Deuteronomy 14:29 (ASV)

And the Levite, because he has no part nor inheritance with
you
Shall come and take the first tithe, according to Jarchi; but though this he was to do, yet is not what is intended here, but he was to partake of the second tithe, or what was in the room of it, the poor's tithe, with whom he is here joined:

and the stranger, and the fatherless, and the widow, which are within
your gates, shall come ;
and take the second tithe, as the above writer rightly interprets it, and which he says is the poor's of this year; see (Deuteronomy 12:12Deuteronomy 12:18) ,

and shall eat and be satisfied ;
make a plentiful meal, eat freely as at a feast; and, as the same writer observes, they were not obliged to eat it at Jerusalem, according to the way they were bound to eat the second tithe of the two years, that is, the two preceding this:

that the Lord your God may bless you in all the work of your hand
which you do ;
as might be expected, when his commands, and particularly those respecting the tithes and firstlings, were obeyed.