From gamal; treatment, i.e. An act (of good or ill); by implication, service or requital -- + as hast served, benefit, desert, deserving, that which he hath given, recompense, reward.
see HEBREW gamal
H1576. gemul
גְּמוּל noun masculine dealing, recompence, benefit — ׳ג Psalm 94:2 11t.; suffix גְּמֻלְךָ Obadiah 15, etc.; plural suffix גְּמוּלָיו 103:2; —
1 יָדַיִם גְּמוּל dealing of the hands Judges 9:16; Proverbs 12:14 (לְ יָשׁוּב) Isaiah 3:11 (לְ יֵעָשֶׂה).
2 dealing, hence (from context) equivalent of dealing, recompence: with suffix Obadiah 15 בראשׁך ישׁוב גמלך, Joel 4:4; Joel 4:7 (הֵשִׁיב), so with לְ הֵשִׁיב Psalm 28:4; לְ שִׁלֵּם 137:8; Proverbs 19:17; absolutely לְ גְּמוּל (הֵשִׁיב) שִׁלֵם Isaiah 59:18 (twice in verse); 66:6; Jeremiah 51:6; Lamentations 3:64; עַל Joel 4:4; Psalm 94:2; Isaiah 35:4 אלהים ׳ג the recompence of God.
3 benefit: גמוליו כל תשׁכחי אַל Psalm 103:2; עליו כגמול according to the benefit (done) unto him2 Chronicles 32:25