John Calvin Commentary Psalms 105:37

"And he brought them forth with silver and gold; And there was not one feeble person among his tribes." — Psalms 105:37 (ASV)

And he brought them forth with silver and gold, the prophet, on the other hand, celebrates the grace of God that preserved the chosen people untouched and safe from all these plagues. If both parties had been indiscriminately afflicted with them, the hand of God would not have been so strikingly apparent.

But now, when the Israelites, amidst so many calamities, experienced complete exemption from harm, this difference shows us, as in a picture, God’s fatherly care for his own people. For this reason, it is stated, Nor was there a feeble person, or one who stumbled; for the verb כשל, kashal, has both these meanings. But I prefer to take it simply in this sense, that while Egypt was hastening to destruction, the people of God were vigorous and free from every malady. When it is said, He brought them forth, and when it is afterwards added, in his tribes, there is a change of number, which is quite common in the Hebrew language. Some refer the word his to God; but I am afraid this is too forced.