Galatians 6:9
9 And let us not grow weary while doing good, for in due season we shall reap if we do not lose heart.
2 Thessalonians 3:13
13 But as for you, brethren, do not grow weary in doing good.
1 Corinthians 15:58
58 Therefore, my beloved brethren, be steadfast, immovable, always abounding in the work of the Lord, knowing that your labor is not in vain in the Lord.
Hebrews 12:3
3 For consider Him who endured such hostility from sinners against Himself, lest you become weary and discouraged in your souls.