Matthew 5:4 NIV

2 Corinthians 1:4-7 NIV
who comforts us in all our troubles, so that we can comfort those in any trouble with the comfort we ourselves receive from God. For just as we share abundantly in the sufferings of Christ, so also our comfort abounds through Christ. If we are distressed, it is for your comfort and salvation; if we are comforted, it is for your comfort, which produces in you patient endurance of the same sufferings we suffer. And our hope for you is firm, because we know that just as you share in our sufferings, so also you share in our comfort.

2 Corinthians 7:9-10 NIV
yet now I am happy, not because you were made sorry, but because your sorrow led you to repentance. For you became sorrowful as God intended and so were not harmed in any way by us. Godly sorrow brings repentance that leads to salvation and leaves no regret, but worldly sorrow brings death.

Isaiah 51:11-12 NIV
Those the Lord has rescued will return. They will enter Zion with singing; everlasting joy will crown their heads. Gladness and joy will overtake them, and sorrow and sighing will flee away. “I, even I, am he who comforts you. Who are you that you fear mere mortals, human beings who are but grass,

Isaiah 57:18 NIV
I have seen their ways, but I will heal them; I will guide them and restore comfort to Israel’s mourners,

Isaiah 61:2-3 NIV
to proclaim the year of the Lord’s favor and the day of vengeance of our God, to comfort all who mourn,     and provide for those who grieve in Zion— to bestow on them a crown of beauty instead of ashes, the oil of joy instead of mourning, and a garment of praise instead of a spirit of despair. They will be called oaks of righteousness, a planting of the Lord for the display of his splendor.

James 1:12 NIV
Blessed is the one who perseveres under trial because, having stood the test, that person will receive the crown of life that the Lord has promised to those who love him.

John 16:20-22 NIV
Very truly I tell you, you will weep and mourn while the world rejoices. You will grieve, but your grief will turn to joy. A woman giving birth to a child has pain because her time has come; but when her baby is born she forgets the anguish because of her joy that a child is born into the world. So with you: Now is your time of grief, but I will see you again and you will rejoice, and no one will take away your joy.

Luke 6:21 NIV
Blessed are you who hunger now, for you will be satisfied. Blessed are you who weep now, for you will laugh.

Revelation 21:4 NIV
‘He will wipe every tear from their eyes. There will be no more death’ or mourning or crying or pain, for the old order of things has passed away.”

Revelation 7:14-17 NIV
I answered, “Sir, you know.” And he said, “These are they who have come out of the great tribulation; they have washed their robes and made them white in the blood of the Lamb. Therefore, “they are before the throne of God and serve him day and night in his temple; and he who sits on the throne will shelter them with his presence. ‘Never again will they hunger; never again will they thirst. The sun will not beat down on them,’ nor any scorching heat. For the Lamb at the center of the throne will be their shepherd; ‘he will lead them to springs of living water.’ ‘And God will wipe away every tear from their eyes.’ ”