The word(s) "sincere" appears 18 time(s) in 18 verse(s) in Quran in Saheeh International translation.

(1) Say, [O Muhammad], "Do you argue with us about Allah while He is our Lord and your Lord? For us are our deeds, and for you are your deeds. And we are sincere [in deed and intention] to Him."

(2) Except for those who repent, correct themselves, hold fast to Allah, and are sincere in their religion for Allah, for those will be with the believers. And Allah is going to give the believers a great reward.

(3) And he swore [by Allah] to them, "Indeed, I am to you from among the sincere advisors."

(4) Say, [O Muhammad], "My Lord has ordered justice and that you maintain yourselves [in worship of Him] at every place [or time] of prostration, and invoke Him, sincere to Him in religion." Just as He originated you, you will return [to life] -

(5) There is not upon the weak or upon the ill or upon those who do not find anything to spend any discomfort when they are sincere to Allah and His Messenger. There is not upon the doers of good any cause [for blame]. And Allah is Forgiving and Merciful.

(6) It is He who enables you to travel on land and sea until, when you are in ships and they sail with them by a good wind and they rejoice therein, there comes a storm wind and the waves come upon them from everywhere and they assume that they are surrounded, supplicating Allah, sincere to Him in religion, "If You should save us from this, we will surely be among the thankful."

(7) They said, "O our father, why do you not entrust us with Joseph while indeed, we are to him sincere counselors?

(8) And We had prevented from him [all] wet nurses before, so she said, "Shall I direct you to a household that will be responsible for him for you while they are to him [for his upbringing] sincere?"

(9) And a man came from the farthest end of the city, running. He said, "O Moses, indeed the eminent ones are conferring over you [intending] to kill you, so leave [the city]; indeed, I am to you of the sincere advisors."

(10) And when they board a ship, they supplicate Allah, sincere to Him in religion. But when He delivers them to the land, at once they associate others with Him