The word(s) "believing" appears 53 time(s) in 43 verse(s) in Quran in Mohsin Khan translation.

(21) And tell the believing women to lower their gaze (from looking at forbidden things), and protect their private parts (from illegal sexual acts) and not to show off their adornment except only that which is apparent (like both eyes for necessity to see the way, or outer palms of hands or one eye or dress like veil, gloves, head-cover, apron, etc.), and to draw their veils all over Juyubihinna (i.e. their bodies, faces, necks and bosoms) and not to reveal their adornment except to their husbands, or their fathers, or their husband's fathers, or their sons, or their husband's sons, or their brothers or their brother's sons, or their sister's sons, or their (Muslim) women (i.e. their sisters in Islam), or the (female) slaves whom their right hands possess, or old male servants who lack vigour, or small children who have no sense of feminine sex. And let them not stamp their feet so as to reveal what they hide of their adornment. And all of you beg Allah to forgive you all, O believers, that you may be successful.

(22) And indeed We gave knowledge to Dawud (David) and Sulaiman (Solomon), and they both said: "All the praises and thanks be to Allah, Who has preferred us above many of His believing slaves!"

(23) And that which she used to worship besides Allah has prevented her (from Islam), for she was of a disbelieving people.

(24) O you who believe! When you marry believing women, and then divorce them before you have sexual intercourse with them, no 'Iddah [divorce prescribed period, see (V.65:4)] have you to count in respect of them. So give them a present, and set them free (i.e. divorce), in a handsome manner.

(25) O Prophet (Muhammad صلى الله عليه وسلم)! Verily, We have made lawful to you your wives, to whom you have paid their Mahr (bridal-money given by the husband to his wife at the time of marriage), and those (slaves) whom your right hand possesses - whom Allah has given to you, and the daughters of your 'Amm (paternal uncles) and the daughters of your 'Ammat (paternal aunts) and the daughters of your Khal (maternal uncles) and the daughters of your Khalat (maternal aunts) who migrated (from Makkah) with you, and a believing woman if she offers herself to the Prophet, and the Prophet wishes to marry her - a privilege for you only, not for the (rest of) the believers. Indeed We know what We have enjoined upon them about their wives and those (slaves) whom their right hands possess, in order that there should be no difficulty on you. And Allah is Ever Oft-Forgiving, Most Merciful.

(26) It is no sin on them (the Prophet's wives, if they appear unveiled) before their fathers, or their sons, or their brothers, or their brother's sons, or the sons of their sisters, or their own (believing) women, or their (female) slaves. And (O ladies), fear (keep your duty to) Allah. Verily, Allah is Ever All-Witness over everything.

(27) And those who annoy believing men and women undeservedly, they bear (on themselves) the crime of slander and plain sin.

(28) Verily, he [Nuh (Noah)] was one of Our believing slaves.

(29) Verily, he was one of Our believing slaves.

(30) Verily, they were two of Our believing slaves.