Numbers 8:25

And from the son of fifty years, he shall turn back from the warfare of the service, and shall serve no more.

Numbers 4:23

From the son of thirty years and above, even to the son of fifty years, thou shalt review them; all going, to war the warfare, to serve the service in the tent of appointment

2 Timothy 4:7

I have contended earnestly the good contest, I have completed the course, I have kept the faith:

Treasury of Scripture Knowledge

Summary

And from the age of fifty years they shall cease waiting upon the service thereof, and shall serve no more:

General references

Bible References

General references

Numbers 4:35
From the son of thirty years and above, even to the son of fifty years, all going forth to war, to the service in the tent of appointment