Matthew 6:18

So that no one may see that you are going without food, but your Father in secret; and your Father, who sees in secret, will give you your reward.

Matthew 6:4

So that your giving may be in secret; and your Father, who sees in secret, will give you your reward.

Matthew 6:6

But when you make your prayer, go into your private room, and, shutting the door, say a prayer to your Father in secret, and your Father, who sees in secret, will give you your reward.

Romans 2:6

Who will give to every man his right reward:

2 Corinthians 5:9

For this reason we make it our purpose, in the body or away from it, to be well-pleasing to him.

2 Corinthians 10:18

For the Lord's approval of a man is not dependent on his opinion of himself, but on the Lord's opinion of him.

Colossians 3:22-24

Servants, in all things do the orders of your natural masters; not only when their eyes are on you, as pleasers of men, but with all your heart, fearing the Lord:

1 Peter 1:7

So that the true metal of your faith, being of much greater value than gold (which, though it comes to an end, is tested by fire), may come to light in praise and glory and honour, at the revelation of Jesus Christ:

1 Peter 2:13

Keep all the laws of men because of the Lord; those of the king, who is over all,

Treasury of Scripture Knowledge

Summary

That thou appear not unto men to fast, but unto thy Father which is in secret: and thy Father, which seeth in secret, shall reward thee openly.

Bible References

Appear

2 Corinthians 5:9
For this reason we make it our purpose, in the body or away from it, to be well-pleasing to him.
2 Corinthians 10:18
For the Lord's approval of a man is not dependent on his opinion of himself, but on the Lord's opinion of him.
Colossians 3:22
Servants, in all things do the orders of your natural masters; not only when their eyes are on you, as pleasers of men, but with all your heart, fearing the Lord:
1 Peter 2:13
Keep all the laws of men because of the Lord; those of the king, who is over all,

Shall

Matthew 6:4
So that your giving may be in secret; and your Father, who sees in secret, will give you your reward.
Romans 2:6
Who will give to every man his right reward:
1 Peter 1:7
So that the true metal of your faith, being of much greater value than gold (which, though it comes to an end, is tested by fire), may come to light in praise and glory and honour, at the revelation of Jesus Christ:

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain