Al-Matalib al-'Aliyah 116 — What is said after wudu

It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Any Muslim servant who performs ablution and performs it very well (completely), then says three times: 'Ashhadu an la ilaha illallahu wahdahu la sharika lahu, wa anna Muhammadan abduhu wa rasuluh' (I bear witness that there is no deity worthy of worship except Allah, alone, without partner, and that Muhammad (peace and blessings be upon him) is His servant and His Messenger), all eight gates of Paradise are opened for him, and he may enter by whichever of them he wishes."
Imam Ibn Abi Shaybah recorded this narration in al-Musannaf (hadith number: 130). In its chain, the narrator named Amr bin Abdullah bin Wahb al-Nakha'i is da'if (weak); however, the virtue of the words of testimony after ablution is established by the sahih narration of Sayyiduna Uqbah bin Amir (may Allah be pleased with him) in Sahih Muslim.