The word(s) "certain" appears 184 time(s) in 178 verse(s) in Quran in Mohsin Khan translation.

(31) And had We appointed him an angel, We indeed would have made him a man, and We would have certainly confused them in which they are already confused (i.e. the Message of Prophet Muhammad صلى الله عليه وسلم).

(32) Nay, it has become manifest to them what they had been concealing before. But if they were returned (to the world), they would certainly revert to that which they were forbidden. And indeed they are liars.

(33) And they said: "Why is not a sign sent down to him from his Lord?" Say: "Allah is certainly Able to send down a sign, but most of them know not."

(34) Thus did we show Ibrahim (Abraham) the kingdom of the heavens and the earth that he be one of those who have Faith with certainty.

(35) And that was Our Proof which We gave Ibrahim (Abraham) against his people. We raise whom We will in degrees. certainly your Lord is All-Wise, All-Knowing.

(36) And why should you not eat of that (meat) on which Allah's Name has been pronounced (at the time of slaughtering the animal), while He has explained to you in detail what is forbidden to you, except under compulsion of necessity? And surely many do lead (mankind) astray by their own desires through lack of knowledge. certainly your Lord knows best the transgressors.

(37) Eat not (O believers) of that (meat) on which Allah's Name has not been pronounced (at the time of the slaughtering of the animal), for sure it is Fisq (a sin and disobedience of Allah). And certainly, the Shayatin (devils) do inspire their friends (from mankind) to dispute with you, and if you obey them [by making Al-Maitah (a dead animal) legal by eating it], then you would indeed be Mushrikun (polytheists); [because they (devils and their friends) made lawful to you to eat that which Allah has made unlawful to eat and you obeyed them by considering it lawful to eat, and by doing so you worshipped them; and to worship others besides Allah is polytheism].

(38) And on the Day when He will gather them (all) together (and say): "O you assembly of jinn! Many did you mislead of men," and their Auliya' (friends and helpers) amongst men will say: "Our Lord! We benefited one from the other, but now we have reached our appointed term which You did appoint for us." He will say: "The Fire be your dwelling-place, you will dwell therein forever, except as Allah may will. certainly your Lord is All-Wise, All-Knowing."

(39) Say (O Muhammad صلى الله عليه وسلم): "O my people! Work according to your way, surely, I too am working (in my way), and you will come to know for which of us will be the (happy) end in the Hereafter. certainly the Zalimun (polytheists and wrong-doers) will not be successful."

(40) And of the camels two (male and female), and of oxen two (male and female). Say: "Has He forbidden the two males or the two females or (the young) which the wombs of the two females enclose? Or were you present when Allah ordered you such a thing? Then who does more wrong than one who invents a lie against Allah, to lead mankind astray without knowledge. certainly Allah guides not the people who are Zalimun (polytheists and wrong-doers)."