The Cow - 2:274
Those who give their money day and night, secretly and openly for charity, their reward is with their Lord. There is no fear for them and they will not grieve.
What is sadness?
The Cow/2:167
"Those who follow will say: "If only we had had another chance, we would have shunned them as they now shun us". So Allah turns what they did into regret; they will not be able to come out of the Fire."
Prophet Jonah/10:54
If a wronged soul had all that is in the earth, it would want to ransom it. When they see the torment, they will feel deep remorse. They will be judged with justice and they will not be wronged.
The Criterion/25:25
The Day when the heavens will break up in clouds and the angels will be sent down in multitudes,
The Criterion/25:26
On that Day the dominion will belong to the Most Merciful, absolutely and completely. It will be a hard day for the disbelievers.
The Criterion/25:27
"On that Day the wrongdoer will bite his hand and say: "If only I had followed the same path with the Messenger"."
The Criterion/25:28
Woe to me, if only I had not taken so-and-so as a friend.
The Criterion/25:29
He led me astray from the message that reached me. Indeed, Satan leads a man astray.
Sheva/34:33
"Those who were disempowered will say to those who were arrogant, "It was you. You were plotting day and night that we should be ungrateful to Allah and associate partners with Him."When they see the torment, they regret in their hearts. We have put shackles on the necks of the disbelievers. Are they not recompensed only for what they used to do?"