New Revised Standard Version
They shall not labor in vain, or bear children for calamity; for they shall be offspring blessed by the LORD— and their descendants as well.

Contemporary English Version
Their work won't be wasted, and their children won't die of dreadful diseases. I will bless their children and their grandchildren.

New American Bible
They shall not toil in vain, nor beget children for sudden destruction; For they shall be a people blessed by the LORD and their descendants with them.

Douay-Rheims Bible
My elect shall not labour in vain, nor bring forth in trouble; for they are the seed of the blessed of the Lord, and their posterity with them.

My elect shall not labour in vain, nor bring forth in trouble; for they are the seed of the blessed of the Lord, and their posterity with them.

shall

Isaiah 49:4 And I said: I have laboured in vain, I have spent my strength without cause and in vain: therefore my judgment is with the Lord, and my work with my God.

Isaiah 55:2 Why do you spend money for that which is not bread, and your labour for that which doth not satisfy you? Hearken diligently to me, and eat that which is good, and your soul shall be delighted in fatness.

Isaiah 61:9 And they shall know their seed among the Gentiles, and their offspring in the midst of peoples: all that shall see them, shall know them, that these are the seed which the Lord hath blessed.

Leviticus 26:3-10,20,22,29 If you walk in my precepts, and keep my commandments, and do them, I will give you rain in due seasons. . . .

Deuteronomy 28:3-12,38-42 Blessed shalt thou be in the city, and blessed in the field. . . .

Hosea 9:11-14 As for Ephraim, their glory hath flown away like bird from the birth, and from the womb, and from the conception. . . .

Haggai 1:6 You have sowed much, and brought in little: you have eaten, but have not had enough: you have drunk, but have not been filled with drink: you have clothed yourselves, but have not been warmed: and he that hath earned wages, put them into a bag with holes.

Haggai 2:19 Is the seed as yet sprung up? or hath the vine, and the fig tree, and the pomegranate, and the olive tree as yet flourished? from this day I will bless you.

Malachi 3:10 Bring all the tithes into the storehouse, that there may be meat in my house, and try me in this, saith the Lord: if I open not unto you the flood-gates of heaven, and pour you out a blessing even to abundance.

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

for

Isaiah 61:9 And they shall know their seed among the Gentiles, and their offspring in the midst of peoples: all that shall see them, shall know them, that these are the seed which the Lord hath blessed.

Genesis 12:2 And I will make of thee a great nation, and I will bless thee, and magnify thy name, and thou shalt be blessed.

Genesis 17:7 And I will establish my covenant between me and thee, and between thy seed after thee in their generations, by a perpetual covenant: to be a God to thee, and to thy seed after thee.

Psalm 115:14,15 May the Lord add blessings upon you: upon you, and upon your children. . . .

Jeremiah 32:38,39 And they shall be my people, and I will be their God. . . .

Zechariah 10:8,9 I will whistle for them, and I will gather them together, because I have redeemed them: and I will multiply them as they were multiplied before. . . .

Acts 2:39 For the promise is to you and to your children and to all that are far off, whomsoever the Lord our God shall call.

Acts 3:25,26 You are the children of the prophets and of the testament which God made to our fathers, saying to Abraham: And in thy seed shall all the kindreds of the earth be blessed. . . .

Romans 4:16 Therefore is it of faith, that according to grace the promise might be firm to all the seed: not to that only which is of the law, but to that also which is of the faith of Abraham, who is the father of us all,

Romans 9:7,8 Neither are all they that are the seed of Abraham, children: but in Isaac shall thy seed be called. . . .

Galatians 3:29 And if you be Christ's, then are you the seed of Abraham, heirs according to the promise.