The word(s) "past" appears 28 time(s) in 27 verse(s) in Quran in Muhammad Pickthal translation.

(21) The life of the world is but a sport and a pastime. And if ye believe and ward off (evil). He will give you your wages, and will not ask of you your wordly wealth.

(22) That Allah may forgive thee of thy sin that which is past and that which is to come, and may perfect His favour unto thee, and may guide thee on a right path,

(23) But when they spy some merchandise or pastime they break away to it and leave thee standing. Say: That which Allah hath is better than pastime and than merchandise, and Allah is the Best of providers.

(24) (And it will be said unto those therein): Eat and drink at ease for that which ye sent on before you in past days.

(25) And produced therefrom the water thereof and the pasture thereof,

(26) Who bringeth forth the pasturage,

(27) Glad for their effort past,