Kissing the thumbs when the mu.adhdhin says: "Ash-hadu anna Muhammadar-Rasool Allaah"
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Question: Is there any basis for kissing the-thumbs when the mu.adhdhin says "Ash-hadu anna Muhammadar-Rasool Allaah"?

Response: From what we know, (the act of) kissing the thumbs when the mu.adhdhin says "Ash-hadu anna Muhammadar-Rasool Allaah" has not been confirmed on the authority of the Prophet (sal-Allaahu `alayhe wa sallam). So kissing them then is an innovation, and it has been confirmed on the authority of the Prophet (sal-Allaahu `alayhe wa sallam) that he said:

((Whoever introduces anything into this matter of ours (i.e. Islaam) that which is not from it, will have it rejected)), [Saheeh al-Bukhaaree/2697 and Saheeh Muslim/1718].

And with Allaah lies all success and may Allaah send prayers and salutations upon our Prophet (sal-Allaahu `alayhe wa sallam) and his family and his companions.

The Permanent Committee for Islaamic Research and Fataawa
Fataawa al-Lajnah ad-Daa.imah - Question No.3 of Fatwa No. 6756;
al-Bid'u wal-Muhdathaat wa maa laa asla lahu - Page 191