The word(s) "certain" appears 498 time(s) in 437 verse(s) in Quran in Muhammad Habib Shakir translation.

(61) They used not to forbid each other the hateful things (which) they did; certainly evil was that which they did.

(62) You will see many of them befriending those who disbelieve; certainly evil is that which their souls have sent before for them, that Allah became displeased with them and in chastisement shall they abide.

(63) certainly you will find the most violent of people in enmity for those who believe (to be) the Jews and those who are polytheists, and you will certainly find the nearest in friendship to those who believe (to be) those who say: We are Christians; this is because there are priests and monks among them and because they do not behave proudly.

(64) O you who believe! Allah will certainly try you in respect of some game which your hands and your lances can reach, that Allah might know who fears Him in secret; but whoever exceeds the limit after this, he shall have a painful punishment.

(65) O you who believe! call to witness between you when death draws nigh to one of you, at the time of making the will, two just persons from among you, or two others from among others than you, if you are travelling in the land and the calamity of death befalls you; the two (witnesses) you should detain after the prayer; then if you doubt (them), they shall both swear by Allah, (saying): We will not take for it a price, though there be a relative, and we will not hide the testimony of Allah for then certainly we should be among the sinners.

(66) Then if it becomes known that they both have been guilty of a sin, two others shall stand up in their place from among those who have a claim against them, the two nearest in kin; so they two should swear by Allah: certainly our testimony is truer than the testimony of those two, and we have not exceeded the limit, for then most surely we should be of the unjust.

(67) And if We had sent to you a writing on a paper, then they had touched it with their hands, certainly those who disbelieve would have said: This is nothing but clear enchantment.

(68) And they say: Why has not an angel been sent down to him? And had We sent down an angel, the matter would have certainly been decided and then they would not have been respited.

(69) And if We had made him angel, We would certainly have made him a man, and We would certainly have made confused to them what they make confused.

(70) And certainly apostles before you were mocked at, but that which they mocked at encompassed the scoffers among them.