Here are the two passages we quoted in the video:
Ibn Ishaq, p. 106—[Muhammad said,] “So I read it, and he departed from me. And I awoke from my sleep, and it was as though these words were written on my heart. (T. Now none of God's creatures was more hateful to me than an (ecstatic) poet or a man possessed: I could not even look at them. I thought, Woe is me poet or possessed—Never shall Quraysh say this of me! I will go to the top of the mountain and throw myself down that I may kill myself and gain rest. So I went forth to do so and then) when I was midway on the mountain, I heard a voice from heaven saying, “O Muhammad! thou art the apostle of God and I am Gabriel.”For more on Muhammad's suicide attempts, click here.
Sahih al-Bukhari 6982— . . . But after a few days Waraqa died and the Divine Revelation was also paused for a while and the Prophet became so sad as we have heard that he intended several times to throw himself from the tops of high mountains and everytime he went up to the top of a mountain in order to throw himself down, Jibril would appear before him and say, “O Muhammad! You are indeed Allah’s Messenger in truth”, whereupon his heart would become quiet and he would calm down and would return home. And whenever the period of the coming of the Revelation used to become long, he would do as before, but when he used to reach the top of a mountain, Jibril would appear before him and say to him what he had said before.