7 verses have
painful
in Edition Clear Qur'an by Talal Itani / At-Tawba (The Repentance)

9:3And a proclamation from God and His Messenger to the people on the day of the Greater Pilgrimage, that God has disowned the polytheists, and so did His Messenger. If you repent, it will be better for you. But if you turn away, know that you cannot escape God. And announce to those who disbelieve a painful punishment.

9:34O you who believe! Many of the rabbis and priests consume people's wealth illicitly, and hinder from God’s path. Those who hoard gold and silver, and do not spend them in God’s cause, inform them of a painful punishment.

9:39Unless you mobilize, He will punish you most painfully, and will replace you with another people, and you will not harm Him at all. God has power over all things.

9:61And among them are those who insult the Prophet, and say, “He is all ears.” Say, “He listens for your own good. He believes in God, and trusts the believers, and is mercy for those of you who believe.” Those who insult the Messenger of God will have a painful penalty.

9:74They swear by God that they said nothing; but they did utter the word of blasphemy, and they renounced faith after their submission. And they plotted what they could not attain. They were resentful only because God and His Messenger have enriched them out of His grace. If they repent, it would be best for them; but if they turn away, God will afflict them with a painful punishment—in this life and in the Hereafter—and they will have on earth no protector and no savior.

9:79Those who criticize the believers who give charity voluntarily, and ridicule those who find nothing to give except their own efforts—God ridicules them. They will have a painful punishment.

9:90Some of the Desert-Arabs came to make excuses, asking to be granted exemption, while those who were untrue to God and His Messenger stayed behind. A painful punishment will afflict those among them who disbelieved.