Galatians 6:9-10

Let us not become weary in doing good, for at the proper time we will reap a harvest if we do not give up. Therefore, as we have opportunity, let us do good to all people, especially to those who belong to the family of believers.

Let us not become weary in doing good 
1 Corinthians 15:58  Therefore, my dear brothers and sisters, stand firm. Let nothing move you. Always give yourselves fully to the work of the Lord, because you know that your labor in the Lord is not in vain. 
2 Corinthians 4:1  Therefore, since through God's mercy we have this ministry, we do not lose heart.

for at the proper time we will reap a harvest if we do not give up 
Job 42:12  The LORD blessed the latter part of Job's life more than the former part. He had fourteen thousand sheep, six thousand camels, a thousand yoke of oxen and a thousand donkeys.
Psalm 126:5  Those who sow with tears will reap with songs of joy.
Hebrews 12:3  Consider him (Jesus) who endured such opposition from sinners, so that you will not grow weary and lose heart.
Revelation 2:10  "Do not be afraid of what you are about to suffer. I tell you, the devil will put some of you in prison to test you, and you will suffer persecution for ten days. Be faithful, even to the point of death, and I will give you life as your victor's crown."

Therefore, as we have opportunity, let us do good to all people 
Proverbs 3:27  Do not withhold good from those to whom it is due, when it is in your power to act.
Titus 2:11-14  For the grace of God has appeared that offers salvation to all people. It teaches us to say "No" to ungodliness and worldly passions, and to live self-controlled, upright and godly lives in this present age, while we wait for the blessed hope--the appearing of the glory of our great God and Savior, Jesus Christ, who gave himself for us to redeem us from all wickedness and to purify for himself a people that are his very own, eager to do what is good.

especially to those who belong to the family of believers 
Ephesians 2:19  Consequently, you are no longer foreigners and strangers, but fellow citizens with God's people and also members of his household, ...
1 Peter 4:17  For it is time for judgment to begin with God's household; and if it begins with us, what will the outcome be for those who do not obey the gospel of God?

(parentheses are mine)

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984, 2011 by Biblica, Inc.® Used by permission. All rights reserved worldwide. 
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