The word(s) "seal" appears 16 time(s) in 16 verse(s) in Quran in Muhammad Pickthal translation.

(11) Or say they: He hath invented a lie concerning Allah? If Allah willed, He could have sealed thy heart (against them). And Allah will wipe out the lie and will vindicate the truth by His words. Lo! He is Aware of what is hidden in the breasts (of men).

(12) Hast thou seen him who maketh his desire his god, and Allah sendeth him astray purposely, and sealeth up his hearing and his heart, and setteth on his sight a covering? Then who will lead him after Allah (hath condemned him)? Will ye not then heed?

(13) Among them are some who give ear unto thee (Muhammad) till, when they go forth from thy presence they say unto those who have been given knowledge: What was that he said just now? Those are they whose hearts Allah hath sealed, and they follow their own lusts.

(14) That is because they believed, then disbelieved, therefore their hearts are sealed so that they understand not.

(15) They are given to drink of a pure wine, sealed,

(16) Whose seal is musk - for this let (all) those strive who strive for bliss -