tabbaci

1. sure as, certain.

   Then by the Lord of the heaven and earth, indeed, it is truth - just as [ sure as ] it is that you are speaking. <> To, kuma Ina rantsuwa da Ubangijin sama da qasa, wannan gaskiya ne, kamar tabbacin gaskiya cewa kuna magana. --Qur'an 51:23

Google translation of tabbaci

Confidence, verification.