The word(s) "themselves" appears 185 time(s) in 176 verse(s) in Quran in Mohsin Khan translation.

(41) Say (O Muhammad صلى الله عليه وسلم): "To whom belongs all that is in the heavens and the earth?" Say: "To Allah. He has prescribed Mercy for Himself. Indeed He will gather you together on the Day of Resurrection, about which there is no doubt. Those who have lost themselves will not believe [in Allah as being the only Ilah (God), and Muhammad صلى الله عليه وسلم as being one of His Messengers, and in Resurrection].

(42) Say (O Muhammad صلى الله عليه وسلم): "Shall I take as a Wali (Helper, Protector, Lord or God) any other than Allah, the Creator of the heavens and the earth? And it is He Who feeds but is not fed." Say: "Verily, I am commanded to be the first of those who submit themselves to Allah (as Muslims)." And be not you (O Muhammad صلى الله عليه وسلم) of the Mushrikun [polytheists, pagans, idolaters and disbelievers in the Oneness of Allah]. (Tafsir Al-Qurtubi)

(43) Those to whom We have given the Scripture (Jews and Christians) recognize him (i.e. Muhammad صلى الله عليه وسلم as a Messenger of Allah, and they also know that there is no Ilah (God) but Allah and Islam is Allah's Religion), as they recognize their own sons. Those who have lost (destroyed) themselves will not believe. (Tafsir At-Tabari).

(44) Look! How they lie against themselves! But the (lie) which they invented will disappear from them.

(45) And they prevent others from him (from following Prophet Muhammad صلى الله عليه وسلم) and they themselves keep away from him, and (by doing so) they destroy not but their ownselves, yet they perceive (it) not.

(46) Verily, We sent (Messengers) to many nations before you (O Muhammad صلى الله عليه وسلم). And We seized them with extreme poverty (or loss in wealth) and loss in health (with calamities) so that they might humble themselves (believe with humility).

(47) When Our Torment reached them, why then did they not humble themselves (believe with humility)? But their hearts became hardened, and Shaitan (Satan) made fair-seeming to them that which they used to do.

(48) O you assembly of jinn and mankind! "Did not there come to you Messengers from amongst you, reciting unto you My Verses and warning you of the meeting of this Day of yours?" They will say: "We bear witness against ourselves." It was the life of this world that deceived them. And they will bear witness against themselves that they were disbelievers.

(49) And surely, We created you (your father Adam) and then gave you shape (the noble shape of a human being); then We told the angels, "Prostrate yourselves to Adam", and they prostrated themselves, except Iblis (Satan), he refused to be of those who prostrated themselves.

(50) So he misled them with deception. Then when they tasted of the tree, that which was hidden from them of their shame (private parts) became manifest to them and they began to cover themselves with the leaves of Paradise (in order to cover their shame). And their Lord called out to them (saying): "Did I not forbid you that tree and tell you: Verily, Shaitan (Satan) is an open enemy unto you?"