I heard the Prophet (ﷺ) saying, "None plots against the people of Medina but that he will be dissolved (destroyed) like the salt is dissolved in water."

Allah's Messenger (ﷺ) invoked evil upon the pagans on the ay (of the battle) of Al-Ahzab, saying, "O Allah! The Revealer of the Holy Book, the Swift-Taker of Accounts, O Allah, defeat Al-Ahzab (i.e. the clans), O Allah, defeat them and shake them."

When Allah's Messenger (ﷺ) intended to enter Mecca he said, "Our destination tomorrow, if Allah wished, will be Khaif Bani Kinana where (the pagans) had taken the oath of Kufr." (Against the Prophet (ﷺ) i.e. to be loyal to heathenism by boycotting Bani Hashim, the Prophet's folk) (See Hadith 3882)

I asked `Abdullah bin `Amr bin Al-`As to inform me of the worst thing the pagans had done to Allah's Apostle. He said: "While Allah's Messenger (ﷺ) was praying in the courtyard of the Ka`ba, `Uqba bin Abi Mu'ait came and seized Allah's Messenger (ﷺ) by the shoulder and twisted his garment round his neck and throttled him severely. Abu Bakr came and seized `Uqba's shoulder and threw him away from Allah's Apostle and said, "Would you kill a man because he says: 'My Lord is Allah,' and has come to you with clear Signs from your Lord?" (40.28)

The Prophet (ﷺ) said, "Who is ready to kill Ka`b bin Al-Ashraf who has really hurt Allah and His Apostle?" Muhammad bin Maslama said, "O Allah's Messenger (ﷺ)! Do you like me to kill him?" He replied in the affirmative. So, Muhammad bin Maslama went to him (i.e. Ka`b) and said, "This person (i.e. the Prophet) has put us to task and asked us for charity." Ka`b replied, "By Allah, you will get tired of him." Muhammad said to him, "We have followed him, so we dislike to leave him till we see the end of his affair." Muhammad bin Maslama went on talking to him in this way till he got the chance to kill him.