Adam Clarke on Isaiah 58:7

Deal thy bread to the hungry - But this thou canst not do, if thou eat it thyself. When a man fasts, suppose he do it through a religious motive, he should give the food of that day, from which he abstains, to the poor and hungry, who, in the course of providence, are called to sustain many involuntary fasts, besides suffering general privations. Wo to him who saves a day's victuals by his religious fast! He should either give them or their value in money to the poor. See Isa 58:6.

That thou bring the poor that are cast out to thy house "To bring the wandering poor into thy house" - πτωχους αστεγους, Septuagint; egenos vagosque, Vulgate; and מטלטלין metaltelin, Chaldee. They read, instead of מרודים merudim, הנודים hanudim. מר mer is upon a rasure in the Bodleian MS. The same MS. reads ביתה bayethah, in domum, "into the house." - L.