The word(s) "assert" appears 12 time(s) in 11 verse(s) in Quran in Muhammad Habib Shakir translation.

(1) Have you not seen those who assert that they believe in what has been revealed to you and what was revealed before you? They desire to summon one another to the judgment of the Shaitan, though they were commanded to deny him, and the Shaitan desires to lead them astray into a remote error.

(2) And on the day when We shall gather them all together, then shall We say to those who associated others (with Allah): Where are your associates whom you asserted?

(3) And certainly you have come to Us alone as We created you at first, and you have left behind your backs the things which We gave you, and We do not see with you your intercessors about whom you asserted that they were (Allah's) associates in respect to you; certainly the ties between you are now cut off and what you asserted is gone from you.

(4) And they set apart a portion for Allah out of what He has created of tilth and cattle, and say: This is for Allah-- so they assert-- and this for our associates; then what is for their associates, it reaches not to Allah, and whatever is (set apart) for Allah, it reaches to their associates; evil is that which they judge.

(5) And they say: These are cattle and tilth prohibited, none shall eat them except such as We please-- so they assert-- and cattle whose backs are forbidden, and cattle on which they would not mention Allah's name-- forging a lie against Him; He shall requite them for what they forged.

(6) Say: Call on those whom you assert besides Him, so they shall not control the removal of distress from you nor (its) transference.

(7) Certainly you have made an abominable assertion

(8) Allah has not made for any man two hearts within him; nor has He made your wives whose backs you liken to the backs of your mothers as your mothers, nor has He made those whom you assert to be your sons your real sons; these are the words of your mouths; and Allah speaks the truth and He guides to the way.

(9) assert their relationship to their fathers; this is more equitable with Allah; but if you do not know their fathers, then they are your brethren in faith and your friends; and there is no blame on you concerning that in which you made a mistake, but (concerning) that which your hearts do purposely (blame may rest on you), and Allah is Forgiving, Merciful.

(10) Say: Call upon those whom you assert besides Allah; they do not control the weight of an atom in the heavens or in the earth nor have they any partnership in either, nor has He among them any one to back (Him) up.