Numbers 32:6

And Moses said unto the children of Gad and to the children of Reuben, Shall your brethren go to war, and shall ye sit here?

Cross-references

2 Samuel 11:11 has Uriah refusing comfort while comrades fight — the same selfless loyalty Moses demands in 32:6.

1 Corinthians 13:5 says love does not seek its own — the principle behind Moses' rebuke of the tribes' selfishness.

Philippians 2:4 commands looking to others' interests — directly opposing the tribes' self-centered request Moses condemns.