The word(s) "righteous" appears 184 time(s) in 178 verse(s) in Quran in Mohsin Khan translation.

(141) And We gave him the glad tidings of Ishaq (Isaac) - a Prophet from the righteous.

(142) [Dawud (David)] said (immediately without listening to the opponent): "He has wronged you in demanding your ewe in addition to his ewes. And, verily, many partners oppress one another, except those who believe and do righteous good deeds, and they are few." And Dawud (David) guessed that We have tried him and he sought Forgiveness of his Lord, and he fell down prostrate and turned (to Allah) in repentance.

(143) Shall We treat those who believe (in the Oneness of Allah - Islamic Monotheism) and do righteous good deeds as Mufsidun (those who associate partners in worship with Allah and commit crimes) on earth? Or shall We treat the Muttaqun (the pious - See V.2:2) as the Fujjar (criminals, disbelievers, the wicked)?

(144) "Our Lord! And make them enter the 'Adn (Eden) Paradise (everlasting Gardens) which you have promised them - and to the righteous among their fathers, their wives, and their offspring! Verily, You are the All-Mighty, the All-Wise.

(145) "Whosoever does an evil deed, will not be requited except the like thereof; and whosoever does a righteous deed, whether male or female and is a true believer (in the Oneness of Allah), such will enter Paradise, where they will be provided therein (with all things in abundance) without limit.

(146) And not equal are the blind and those who see; nor are (equal) those who believe (in the Oneness of Allah - Islamic Monotheism), and do righteous good deeds, and those who do evil. Little do you remember!

(147) He is the Ever Living, La ilaha illa Huwa (none has the right to be worshipped but He); so invoke Him making your worship pure for Him Alone (by worshipping Him Alone, and none else, and by doing righteous deeds sincerely for Allah's sake only, and not to show off, and not setting up rivals with Him in worship). All the praises and thanks be to Allah, the Lord of the 'Alamin (mankind, jinn and all that exists).

(148) Truly, those who believe (in the Oneness of Allah, and in His Messenger Muhammad صلى الله عليه وسلم - Islamic Monotheism) and do righteous good deeds, for them will be an endless reward that will never stop (i.e. Paradise).

(149) And who is better in speech than he who [says: "My Lord is Allah (believes in His Oneness)," and then stands firm (acts upon His Order), and] invites (men) to Allah's (Islamic Monotheism), and does righteous deeds, and says: "I am one of the Muslims."

(150) Whosoever does righteous good deed, it is for (the benefit of) his ownself; and whosoever does evil, it is against his ownself. And your Lord is not at all unjust to (His) slaves.