Musannaf Ibn Abi Shayba 21:698

Hussain bin Ali narrated to us, from Za'idah, from Hisham, from Abu Yunus, from Tawus, who said: "Whoever recites 'Alif-Lam-Mim Tanzil' (Surah As-Sajdah) and 'Tabarak Alladhi Biyadihi Al-Mulk' (Surah Al-Mulk), it is for him like the reward of Laylat al-Qadr." He said: Then 'Ata' passed by, so we said to a man among us, "Go to him and ask him." He said: "He spoke the truth; I have not abandoned them since I heard them."