What to say upon completing Ablution (Wudu)
Though the wording of the Declaration (in grey below), exists in Sahih Muslim (as per the last post), Tirmidhi [1] reported the following addition (in white below),

Note:

This hadith is graded as Daif (weak) in [1]. But the following comment is presented in [1] , “This narration, just with the wording of the Declaration, exists in Sahih Muslim; and the addition of “Allahum-maj’al-nee minat-tawwabeena waj’alnee minal mutatahhireen” [O Allah! Make me one of those who repent in abundance and make me of those who are clean and pure] this addition is proven authentic see Irwa’ul-Ghalil 1/135, and Al-Jami’As-Saghir 1/1112″.

Ref:
[1] “English Translation of Jāmi‘ At-Tirmidhī”. Compiled by Mohammad Ibn ‘Eisā At-Tirmidhi et al. Darussalam. Nov, 2007. Volume 1, Hadith #55 (Daif), pg 83
[2] “Fortress of the Muslim, Invocations from the Qur’an and Sunnah”. Compiled by Said bin Wahf Al-Qahtani. Darussalam. 5th Edition Apr, 2006. pg 29

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