The word(s) "acknowledge" appears 2 time(s) in 2 verse(s) in Quran in Mohsin Khan translation.

(1) Fight against those who (1) believe not in Allah, (2) nor in the Last Day, (3) nor forbid that which has been forbidden by Allah and His Messenger Muhammad (صلى الله عليه وسلم) (4) and those who acknowledge not the religion of truth (i.e. Islam) among the people of the Scripture (Jews and Christians), until they pay the Jizyah with willing submission, and feel themselves subdued.

(2) And (there are) others who have acknowledged their sins, they have mixed a deed that was righteous with another that was evil. Perhaps Allah will turn unto them in forgiveness. Surely, Allah is Oft-Forgiving, Most Merciful.