Mu'jam Kabir Tabarani 7288 — he said: When the Prophet ﷺ prayed

It is narrated from Sayyiduna Suhayb (may Allah be pleased with him) that he said: When the Prophet (peace and blessings be upon him) prayed the afternoon prayer (Asr), he would do 'hams', and 'hams', according to some, means moving the lips as though saying something. It was said to him (peace and blessings be upon him): O Prophet of Allah, when you pray the afternoon prayer, you do 'hams'? He (peace and blessings be upon him) said: "One of the prophets was delighted with his nation, and he said: Who can stand against these? So Allah, the Mighty and Majestic, revealed to him: Give them the choice between My taking vengeance on them and My setting their enemy upon them. They chose vengeance, so death was set upon them, and seventy thousand of them died in a single day."
The narrator said: Whenever he (peace and blessings be upon him) narrated this hadith, he (peace and blessings be upon him) would also narrate this other hadith. He said: "There was a king among the kings, and that king had a soothsayer who practised soothsaying for him. That soothsayer said: Find me an intelligent boy, or he said: a quick-witted one, so that I may teach him this knowledge of mine, for I fear that I will die and this knowledge will be cut off from you, and there will be no one among you who knows it. So they found a boy with the qualities he had described, and ordered him to attend upon that soothsayer and to go to him regularly. He said: On the boy's way there was a monk in a hermitage. Ma'mar (may Allah have mercy on him) said: I think that the people of the hermitages were Muslims at that time. Whenever the boy passed by the monk, he would ask him about his religion, until he told him, saying: I worship only Allah. So the boy began to stay with the monk and to be late to the soothsayer. The soothsayer sent word to the boy's family that he hardly ever attends upon me. The boy told the monk of this, and the monk said to him: When the soothsayer asks you: Where were you? say: With my family. And when your family ask you: Where were you? say: With the soothsayer. While the boy was in this state, he passed by a large crowd of people whom a beast had held back, and some of them said: That beast was a lion. The boy took a stone and said: O Allah, if what the monk says is true, then I ask You that I kill this beast; and if what the soothsayer says is true, that I not kill it. Then he threw it at it and the beast was killed. The people said: Who killed it? They said: The boy. The people rushed to him in alarm and said: This boy has learned a knowledge that no one has learned. A blind man heard of him and came to him, and the blind man said to him: If you restore my sight to me, you shall have such-and-such. The boy said to him: I do not want this from you; but tell me, if your sight comes back to you, will you believe in the One who restored it to you? He said: Yes. So he supplicated to Allah, the Mighty and Majestic, and his sight came back, and the blind man believed. News of them reached the king, so he sent for them and they were brought, and he said: I will kill each one of you with a death by which I will not kill the other. He gave orders concerning the monk and the man who had been blind, and a saw was placed on the parting of the head of one of them, and he was killed; and he killed the other by another kind of death. Then he gave orders concerning the boy and said: Take him to such-and-such a mountain and throw him down from its top. When they took him to that mountain and reached the place they intended, they themselves began to fall and tumble down from the mountain, until none remained but the boy. Then the boy returned, and the king gave orders concerning him and said: Take him to the sea and throw him into it. They took him to the sea, and Allah drowned those who were with him and saved him. Then the boy said: You will never kill me until you crucify me, then shoot me, and when you shoot me, say: 'In the name of Allah, the Lord of this boy,' or he said: 'In the name of Allah, the Lord of the boy.' So he gave orders concerning him and he was crucified; then he said: 'In the name of Allah, the Lord of the boy,' and the boy placed his hand on his temple and then died. The people said: This boy learned a knowledge that no one learned; we believe in the Lord of this boy. It was said to the king: Were you distressed that three people opposed you? Now all these people have opposed you. So he dug a trench, put firewood and fire in it, then gathered the people and said: Whoever returns to his religion, we will leave him; and whoever does not return, we will throw him into this fire. And he began throwing them into that trench." This is the saying of Allah, the Mighty and Majestic: "Destroyed were the companions of the trench, of the fire full of fuel" [Surah al-Buruj: 4-5], up to "the Almighty, the Praiseworthy" [Surah al-Buruj: 8]. And it is mentioned that the boy was brought out in the time of Umar bin al-Khattab (may Allah be pleased with him) with his hand placed on his temple, just as he had placed it when he was killed.