The word(s) "sum" appears 37 time(s) in 36 verse(s) in Quran in Muhammad Pickthal translation.

(21) Lo! We offered the trust unto the heavens and the earth and the hills, but they shrank from bearing it and were afraid of it. And man assumed it. Lo! he hath proved a tyrant and a fool.

(22) Lo! the devil is an enemy for you, so treat him as an enemy. He only summoneth his faction to be owners of the flaming Fire.

(23) And, O my people! Lo! I fear for you a Day of summoning,

(24) Unto this, then, summon (O Muhammad). And be thou upright as thou art commanded, and follow not their lusts, but say: I believe in whatever scripture Allah hath sent down, and I am commanded to be just among you. Allah is our Lord and your Lord. Unto us our works and unto you your works; no argument between us and you. Allah will bring us together, and unto Him is the journeying.

(25) And thou wilt see each nation crouching, each nation summoned to its record. (And it will be said unto them): This day ye are requited what ye used to do.

(26) O our people! respond to Allah's summoner and believe in Him. He will forgive you some of your sins and guard you from a painful doom.

(27) And whoso respondeth not to Allah's summoner he can nowise escape in the earth, and he hath no protecting friends instead of Him. Such are in error manifest.

(28) Such is their sum of knowledge. Lo! thy Lord is Best Aware of him who strayeth, and He is Best Aware of him whom goeth right.

(29) So withdraw from them (O Muhammad) on the day when the summoner summoneth unto a painful thing.

(30) Hastening toward the summoner; the disbelievers say: This is a hard day.