Sayyiduna Ubadah bin al-Samit (may Allah be pleased with him) narrates: I heard the Prophet (peace and blessings be upon him) say: "Whoever recites ten verses in a night will not be recorded among the heedless (al-ghafilin); whoever recites one hundred verses, the reward of a whole night of worship will be recorded for him; whoever recites two hundred verses, his name will be recorded among the devoutly obedient (al-qanitin); whoever recites four hundred verses, his name will be recorded among the humble (al-mukhbitin); whoever recites one thousand verses, the reward of a qintar will be recorded for him, which is one thousand two hundred (i.e. twelve hundred) uqiyyah, and the uqiyyah is better than everything between the heaven and the earth; and whoever recites two thousand verses will be among those for whom (Paradise) is made due (al-mujibin)."
Al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains Yahya bin Uqbah bin Abi al-Ayzar, who is da'if (weak).