Why do Muslims wipe their face with both hands when reciting the Kalima, or at the end of a Du’aa? Why some kiss their thumbnails and rub their eyes at the mention of the name Muhammad S.A.W.S.?

1. It is narrated in Tirmidhi that Rasulullah (Sallallaahu Alayhi Wasallam) should not lower his hands after making Du'aa except after passing them over his face. This Hadith is supported by many other Ahaadith. (Bulooghul Maraam Hadith 1595)
2. The aforementioned practice is unfortunately very widespread in different parts of the world. Consequently, it has been based on a narration which has been classified as a fabrication by the masters of Hadith, i.e. Hafiz Sakhawi (RA) (AlMaqaasidul Hasana pg.450); Hafiz Ibnuddaiba (Tamyeez uthayba pg.171-2); Hafiz Ibn Taahir al-Fattaany (Tazkiratul Mawdhoo'aat pg.34); Shaykh Abdul Fattah Abu Ghuddah (footnotes on Al-Masnoo of Mulla Ali Qari pg.169) and others. Considering such an action to be Waajib, Sunnat or as part of Deen is wrong.
3. It is narrated from ibn Malaaikah that Ikramah ibn Abi Jahl (Radhiallaahu Anhu) should touch the Qur'aan to his face and say this is the speech of my lord. This is the speech of my Lord. This practice is not a Sunnah, rather it is done for respect and love for the noble Qur'aan and words of Allah.

and Allah Ta'ala Knows Best

Mufti Ebrahim Desai