Genesis 14:21

21. the king of Sodom said ... Give me the persons--According to the war customs still existing among the Arab tribes, Abram might have retained the recovered goods, and his right was acknowledged by the king of Sodom. But with honest pride, and a generosity unknown in that part of the world, he replied with strong phraseology common to the East, "I have lifted up mine hand" [that is, I have sworn] unto the Lord that I will not take from a thread even to a sandal-thong, and that that I will not take any thing that [is] thine, lest thou shouldst say, I have made Abram rich" [Ge 14:22, 23].

Robert Jamieson, A. R. Fausset & David Brown, 1871 · public domain

Observe the king of Sodom's grateful offer to Abram, Give me the souls, and take thou the substance. Gratitude teaches us to recompense to the utmost of our power, those that have undergone fatigues, run hazards, and been at expense for our service and benefit. Abram generously refused this offer. He accompanies his refusal with a good reason, Lest thou shouldest say, I have made Abram rich: which would reflect upon the promise promise and covenant of God, as if He would not have enriched Abraham without the spoils of Sodom. The people of God must, for their credit's sake, take heed of doing any thing that looks mean or mercenary, or that savors of covetousness and self-seeking. Abraham can trust the Possessor of Heaven and earth to provide for him.

Matthew Henry, 1706 · public domain