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

(121) And if you should question them, they would certainly say: We were only idly discoursing and sporting. Say: Was it at Allah and His communications and His Apostle that you mocked?

(122) They swear by Allah that they did not speak, and certainly they did speak, the word of unbelief, and disbelieved after their Islam, and they had determined upon what they have not been able to effect, and they did not find fault except because Allah and His Apostle enriched them out of His grace; therefore if they repent, it will be good for them; and if they turn back, Allah will chastise them with a painful chastisement in this world and the hereafter, and they shall not have in the land any guardian or a helper.

(123) And there are those of them who made a covenant with Allah: If He give us out of His grace, we will certainly give alms and we will certainly be of the good.

(124) And those who built a masjid to cause harm and for unbelief and to cause disunion among the believers and an ambush to him who made war against Allah and His Apostle before; and they will certainly swear: We did not desire aught but good; and Allah bears witness that they are most surely liars.

(125) Never stand in it; certainly a masjid founded on piety from the very first day is more deserving that you should stand in it; in it are men who love that they should be purified; and Allah loves those who purify themselves.

(126) certainly Allah has turned (mercifully) to the Prophet and those who fled (their homes) and the helpers who followed him in the hour of straitness after the hearts of a part of them were about to deviate, then He turned to them (mercifully); surely to them He is Compassionate, Merciful.

(127) And to the three who were left behind, until the earth became strait to them notwithstanding its spaciousness and their souls were also straitened to them; and they knew it for certain that there was no refuge from Allah but in Him; then He turned to them (mercifully) that they might turn (to Him); surely Allah is the Oft-returning (to mercy), the Merciful.

(128) certainly an Apostle has come to you from among yourselves; grievous to him is your falling into distress, excessively solicitous respecting you; to the believers (he is) compassionate,

(129) And if Allah should hasten the evil to men as they desire the hastening on of good, their doom should certainly have been decreed for them; but We leave those alone who hope not for Our meeting in their inordinacy, blindly wandering on.

(130) And certainly We did destroy generations before you when they were unjust, and their apostles had come to them with clear arguments, and they would not believe; thus do We recompense the guilty people.