"I said: 'O Messenger of Allah! Surah Al-Hajj has been esteemed by two prostrations?' He said: 'Yes, and whoever does not prostrate for them, he should not recite them.'"
Jami` at-Tirmidhi Book 6, Hadith 35
← Previous Hadith "I saw the Messenger of Allah prostrating for (Surat) Sad." Ibn Abbas said: "It is not one of the resolute prostrations."

Jami` at-Tirmidhi Book 6, Hadith 34 Next Hadith → Ibn Juraij said to me: O Hasan! Ubaidullah bin Abi Yazid informed me that Ibn Abbas said: "A man came to the Prophet and said: 'O Messenger of Allah! I had a dream at night while I was sleeping in which I was praying behind a tree, when I prostrated the tree prostrated along with me. Then I heard it saying: (Allahummaktuh li biha indaka ajran, wad a anni biha wizran, waj'alha li biha indaka dhukhran, wa taqabbalha minni kama taqabbaltaha min abdiki Dawud.)" (O Allah! Record for me, a reward with You for it, remove a sin for me by it, and store it away for me with You, and accept it from me as You accepted it from Your worshipper Dawud). Al-Hasan said: "Ibn Juraij said to me: 'Your grandfather said to me: 'Ibn Abbas said: 'So the Prophet recited (an Ayah of) prostration then prostrated.'" (He said) "So Ibn Abbas said: 'I listened to him, and he was saying the same as the man informed that the tree had said.'"

Jami` at-Tirmidhi Book 6, Hadith 36