Mark 9:41

If any one gives you a cup of water because you belong to Christ, I tell you, he shall assuredly not lose his reward.

Matthew 10:42

And, if any one gives but a cup of cold water to one of these lowly ones because he is a disciple, I tell you that he shall assuredly not lose his reward."

Matthew 25:40

And the King will reply 'I tell you, as often as you did it to one of these my Brothers, however lowly, you did it to me.'

John 19:25-27

Meanwhile near the cross of Jesus were standing his mother and his mother's sister, as well as Mary the wife of Clopas and Mary of Magdala.

Romans 8:9

You, however, are not earthly but spiritual, since the Spirit of God lives within you. Unless a man has the Spirit of Christ, he does not belong to Christ;

Romans 14:15

If, for the sake of what you eat, you wound your Brother's feelings, your life has ceased to be ruled by love. Do not, by what you eat, ruin a man for whom Christ died!

1 Corinthians 3:23

But you are Christ's and Christ is God's.

1 Corinthians 15:23

But each in his proper order-Christ the first-fruits; afterwards, at his Coming, those who belong to the Christ.

2 Corinthians 10:7

You look at the outward appearance of things! Let any one, who is confident that he belongs to Christ, reflect, for himself, again upon the fact--that we belong to Christ no less than he does.

Galatians 3:29

And, since you belong to Christ, it follows that you are Abraham's offspring and, under the promise, sharers in the inheritance.

Galatians 5:24

And those who belong to Jesus, the Christ, have already crucified their earthly nature, with its passions and its cravings.

Treasury of Scripture Knowledge

Summary

For whosoever shall give you a cup of water to drink in my name, because ye belong to Christ, verily I say unto you, he shall not lose his reward.

Bible References

Whosoever

Matthew 10:42
And, if any one gives but a cup of cold water to one of these lowly ones because he is a disciple, I tell you that he shall assuredly not lose his reward."
Matthew 25:40
And the King will reply 'I tell you, as often as you did it to one of these my Brothers, however lowly, you did it to me.'

Because

John 19:25
Meanwhile near the cross of Jesus were standing his mother and his mother's sister, as well as Mary the wife of Clopas and Mary of Magdala.
Romans 8:9
You, however, are not earthly but spiritual, since the Spirit of God lives within you. Unless a man has the Spirit of Christ, he does not belong to Christ;
Romans 14:15
If, for the sake of what you eat, you wound your Brother's feelings, your life has ceased to be ruled by love. Do not, by what you eat, ruin a man for whom Christ died!
1 Corinthians 3:23
But you are Christ's and Christ is God's.
1 Corinthians 15:23
But each in his proper order-Christ the first-fruits; afterwards, at his Coming, those who belong to the Christ.
2 Corinthians 10:7
You look at the outward appearance of things! Let any one, who is confident that he belongs to Christ, reflect, for himself, again upon the fact--that we belong to Christ no less than he does.
Galatians 3:29
And, since you belong to Christ, it follows that you are Abraham's offspring and, under the promise, sharers in the inheritance.
Galatians 5:24
And those who belong to Jesus, the Christ, have already crucified their earthly nature, with its passions and its cravings.