John Gill Commentary Isaiah 58:10

"and if thou draw out thy soul to the hungry, and satisfy the afflicted soul: then shall thy light rise in darkness, and thine obscurity be as the noonday;" — Isaiah 58:10 (ASV)

And if you draw out your soul to the hungry Not only deal out your bread, but your soul also, to him; that is, give him food cheerfully, with a good will, expressing a hearty love and affection for him; do it heartily, as to the Lord; let your soul go along with it; and this is true of affectionate ministers of the Gospel, who not only impart that, but their own souls also, (1 Thessalonians 2:8).

and satisfy the afflicted soul Distressed for want of food; not only give it food, but to the full; not only just enough to support life, but to satisfaction; or so as to be filled with good things, or however a sufficiency of them.

then shall your light rise in obscurity, and your darkness be as the noonday In the midst of darkness of affliction, or desertion, the light of prosperity and joy shall spring up, and a dark night of sorrow and distress become a clear day of peace and comfort; see (Psalms 112:4) (Isaiah 42:16), at evening time it shall be light, (Zechariah 14:7).