1 Chronicles 5:18

the sons of Reuben and Gad, and half tribe of Manasseh, of the sons of valour, men bearing shield and sword and bending the bow, and instructed in war, were forty-four thousand and seven hundred and sixty, ready to go forth in the host.

Numbers 1:3

from twenty years old and upwards, every one able to go forth to war in Israel, - ye shall number them by their hosts, thou and Aaron;

Joshua 4:12-13

Also the sons of Reuben and the sons of Gad and the hall tribe of Manasseh, passed over, armed, before the sons of Israel, - as Moses had spoken unto them:

Treasury of Scripture Knowledge

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
Also the sons of Reuben and the sons of Gad and the hall tribe of Manasseh, passed over, armed, before the sons of Israel, - as Moses had spoken unto them: