Acts 2:39

For the promise is to you, and to your children, and to all that are afar off, whomsoever the Lord our God shall call.

Acts 3:25-26

Ye are the sons of the prophets and of the covenant which God made with our fathers, saying to Abraham, And in thy seed shall all the families of the earth be blessed.

Romans 4:16

Therefore it is of faith, that it might be of grace, that the promise might be firm to all the seed; not only to that which is of the law, but to that also which is of the faith of Abraham, who is the father of us all, (As it is written,

Romans 9:7-8

Neither because they are the seed of Abraham, are they all children, but in Isaac shall thy seed be called:

1 Corinthians 15:58

Therefore, my beloved brethren, be ye stedfast, unmovable, always abounding in the work of the Lord, knowing that your labour is not vain in the Lord.

Galatians 3:29

And if ye are Christ's, then are ye the seed of Abraham, and heirs according to the promise.

Treasury of Scripture Knowledge

Summary

They shall not labour in vain, nor bring forth for trouble; for they are the seed of the blessed of the LORD, and their offspring with them.

Bible References

Shall

1 Corinthians 15:58
Therefore, my beloved brethren, be ye stedfast, unmovable, always abounding in the work of the Lord, knowing that your labour is not vain in the Lord.

For

Acts 2:39
For the promise is to you, and to your children, and to all that are afar off, whomsoever the Lord our God shall call.
Acts 3:25
Ye are the sons of the prophets and of the covenant which God made with our fathers, saying to Abraham, And in thy seed shall all the families of the earth be blessed.
Romans 4:16
Therefore it is of faith, that it might be of grace, that the promise might be firm to all the seed; not only to that which is of the law, but to that also which is of the faith of Abraham, who is the father of us all, (As it is written,
Romans 9:7
Neither because they are the seed of Abraham, are they all children, but in Isaac shall thy seed be called:
Galatians 3:29
And if ye are Christ's, then are ye the seed of Abraham, and heirs according to the promise.