The word(s) "mindful" appears 13 time(s) in 11 verse(s) in Quran in Muhammad Pickthal translation.

(11) O ye who believe! Be mindful of your duty to Allah and put faith in His messenger. He will give you twofold of His mercy and will appoint for you a light wherein ye shall walk, and will forgive you. Allah is Forgiving, Merciful;