1 Chronicles 5:18

The sons of Reuben, and the Gadites, and half the tribe of Manasseh, of valiant men, men able to bear buckler and sword, and to shoot with bow, and skillful in war, were four and forty thousand seven hundred and sixty, that went out to the war.

Numbers 1:3

From twenty years old and upward, all that are able to go forth to war in Israel; thou and Aaron shall number them by their armies.

Joshua 4:12-13

And the children of Reuben, and the children of Gad, and half the tribe of Manasseh, passed over armed before the children of Israel, as Moses directed them:

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Summary

The sons of Reuben, and the Gadites, and half the tribe of Manasseh, of valiant men, men able to bear buckler and sword, and to shoot with bow, and skilful in war, were four and forty thousand seven hundred and threescore, that went out to the war.

Four and forty

Bible References

Four and forty

Joshua 4:12
And the children of Reuben, and the children of Gad, and half the tribe of Manasseh, passed over armed before the children of Israel, as Moses directed them: