Melachim Bais 15:20

20 And Menahem exacted the kesef from Yisroel, even of all the wealthy Gibborim, of each man fifty shekels of kesef, to give to Melech Ashur. So Melech Ashur withdrew and stayed not there in HaAretz.

Melachim Bais 15:20 Meaning and Commentary

2 Kings 15:20

And Menahem exacted the money of Israel, even of all the
mighty men of wealth
Who were most able to pay it, by which means he eased the poor, and might thereby attach them to him:

of each man fifty shekels of silver, to give to the king of Assyria:
that is, he required them to pay fifty shekels apiece to make up the above sum as a present to Pul; though the words in the original text lie more naturally thus, "to give to the king of Assyria fifty shekels of silver for one man"; that is, for every man in his army; which amounted to about six pounds a man:

so the king of Assyria turned back;
to his own country:

and stayed not there in the land;
in the land of Israel, neither to distress nor to help Menahem, for which he gave him the money.

Melachim Bais 15:20 In-Context

18 And he did that which was rah in the eyes of Hashem; he departed not all his yamim from the chattot Yarov‘am Ben Nevat, who caused Yisroel to commit sin.

19 And Pul Melech Ashur (Assyria) came against HaAretz and Menahem gave Pul a thousand talents of kesef, that his yad might be with him [supporting Menahem} to make the Mamlakhah chazakah in his yad.

20 And Menahem exacted the kesef from Yisroel, even of all the wealthy Gibborim, of each man fifty shekels of kesef, to give to Melech Ashur. So Melech Ashur withdrew and stayed not there in HaAretz.

21 And the rest of the acts of Menahem, and all that he did, are they not written in the Sefer Divrei HaYamim L’Malkhei Yisroel?

22 And Menahem slept with his avot; and Pekachyah bno reigned as melech in his place.