The word(s) "add" appears 48 time(s) in 46 verse(s) in Quran in Abdullah Yusuf Ali translation.

(41) The Unbelievers will be addressed: "Greater was the aversion of Allah to you than (is) your aversion to yourselves, seeing that ye were called to the Faith and ye used to refuse."

(42) It is He Who sent down tranquillity into the hearts of the Believers, that they may add faith to their faith;- for to Allah belong the Forces of the heavens and the earth; and Allah is Full of Knowledge and Wisdom;-

(43) That play (and paddle) in shallow trifles.

(44) Or have they a ladder, by which they can (climb up to heaven and) listen (to its secrets)? Then let (such a) listener of theirs produce a manifest proof.

(45) "And they have said (to each other), 'Abandon not your gods: Abandon neither Wadd nor Suwa', neither Yaguth nor Ya'uq, nor Nasr';-

(46) Yet is he greedy-that I should add (yet more);-