The word(s) "truly" appears 138 time(s) in 136 verse(s) in Quran in Mohsin Khan translation.

(71) We narrate unto you (O Muhammad صلى الله عليه وسلم) their story with truth: truly they were young men who believed in their Lord (Allah), and We increased them in guidance.

(72) And who does more wrong than he who is reminded of the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) of his Lord, but turns away from them, forgetting what (deeds) his hands have sent forth. truly, We have set veils over their hearts lest they should understand this (the Qur'an), and in their ears, deafness. And if you (O Muhammad صلى الله عليه وسلم) call them to guidance, even then they will never be guided.

(73) So when they had passed further on (beyond that fixed place), Musa (Moses) said to his boy-servant: "Bring us our morning meal; truly, we have suffered much fatigue in this, our journey."

(74) "truly, it has been revealed to us that the torment will be for him who denies [believes not in the Oneness of Allah, and in His Messengers.], and turns away (from the truth and obedience of Allah)."

(75) And We admitted him to Our Mercy; truly, he was of the righteous.

(76) And (remember) Dhun-Nun (Jonah), when he went off in anger, and imagined that We shall not punish him (i.e. the calamities which had befallen him)! But he cried through the darkness (saying): La ilaha illa Anta [none has the right to be worshipped but You (O, Allah)], Glorified (and Exalted) be You [above all that (evil) they associate with You]! truly, I have been of the wrong-doers."

(77) truly! This, your Ummah [Shari'ah or religion (Islamic Monotheism)] is one religion, and I am your Lord, therefore worship Me (Alone). [Tafsir Ibn Kathir]

(78) And (remember) the Day when We shall roll up the heaven like a scroll rolled up for books. As We began the first creation, We shall repeat it. (It is) a promise binding upon Us. truly, We shall do it.

(79) truly, Allah will admit those who believe (in Islamic Monotheism) and do righteous good deeds (according to the Qur'an and the Sunnah) to Gardens underneath which rivers flow (in Paradise). Verily, Allah does what He wills.

(80) Verily, those who believe (in Allah and in His Messenger Muhammad صلى الله عليه وسلم), and those who are Jews, and the Sabians, and the Christians, and the Majus, and those who worship others besides Allah, truly, Allah will judge between them on the Day of Resurrection. Verily! Allah is over all things a Witness.