Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
KJV

Numbers 31:39

And the asses were thirty thousand and five hundred; of which the Lord’s tribute was threescore and one.

Parallel Translations

LXXView canonical →
And asses, thirty thousand and five hundred, and the tribute to the Lord, sixty-one:
Brenton's Septuagint Translation
LXX2012View canonical →
And asses, thirty thousand and five hundred, and the tribute to the Lord, sixty-one:
Septuagint in American English (2012)
WEBView canonical →
The donkeys were thirty thousand five hundred, of which Yahweh’s tribute was sixty-one.
World English Bible