The word(s) "certain" appears 25 time(s) in 25 verse(s) in Quran in Muhammad Pickthal translation.

(11) Thus did We show Abraham the kingdom of the heavens and the earth that he might be of those possessing certainty:

(12) Go, O my sons, and ascertain concerning Joseph and his brother, and despair not of the Spirit of Allah. Lo! none despaireth of the Spirit of Allah save disbelieving folk.

(13) Allah it is Who raised up the heavens without visible supports, then mounted the Throne, and compelled the sun and the moon to be of service, each runneth unto an appointed term; He ordereth the course; He detaileth the revelations, that haply ye may be certain of the meeting with your Lord.

(14) So they twain journeyed on till, when they came unto the folk of a certain township, they asked its folk for food, but they refused to make them guests. And they found therein a wall upon the point of falling into ruin, and he repaired it. (Moses) said: If thou hadst wished, thou couldst have taken payment for it.

(15) (Pharaoh) said: Ye put faith in him before I give you leave. Lo! he is your chief who taught you magic. Now surely I shall cut off your hands and your feet alternately, and I shall crucify you on the trunks of palm trees, and ye shall know for certain which of us hath sterner and more lasting punishment.

(16) Thus we have revealed it as a Lecture in Arabic, and have displayed therein certain threats, that peradventure they may keep from evil or that it may cause them to take heed.

(17) So have patience (O Muhammad)! Allah's promise is the very truth, and let not those who have no certainty make thee impatient.

(18) And when a party of them said: O folk of Yathrib! There is no stand (possible) for you, therefor turn back. And certain of them (even) sought permission of the Prophet, saying: Our homes lie open (to the enemy). And they lay not open. They but wished to flee.

(19) There is no reproach for the Prophet in that which Allah maketh his due. That was Allah's way with those who passed away of old - and the commandment of Allah is certain destiny -

(20) And unto Solomon (We gave) the wind, whereof the morning course was a month's journey and the evening course a month's journey, and We caused the fount of copper to gush forth for him, and (We gave him) certain of the jinn who worked before him by permission of his Lord. And such of them as deviated from Our command, them We caused to taste the punishment of flaming Fire.