The word(s) "six" appears 13 time(s) in 12 verse(s) in Quran in Muhammad Habib Shakir translation.

(11) But whoever has not the means, let him fast for two months successively before they touch each other; then as for him who is not able, let him feed sixty needy ones; that is in order that you may have faith in Allah and His Apostle, and these are Allah's limits, and the unbelievers shall have a painful punishment.

(12) Do you not see that Allah knows whatever is in the heavens and whatever is in the earth? Nowhere is there a secret counsel between three persons but He is the fourth of them, nor (between) five but He is the sixth of them, nor less than that nor more but He is with them wheresoever they are; then He will inform them of what they did on the day of resurrection: surely Allah is Cognizant of all things.