2 verses have
“sincere”
in Edition Clear Qur'an by Talal Itani / Al-Hujuraat (The Inner Apartments)
49:15The believers are those who believe in God and His Messenger, and then have not doubted, and strive for God’s cause with their wealth and their persons. These are the sincere.
49:17They regarded it a favor to you that they have submitted. Say, “Do not consider your submission a favor to me; it is God who has done you a favor by guiding you to the faith, if you are sincere.”
Support Ayat Al Quran
Those who spend their wealth by night and day, privately and publicly, will receive their reward from their Lord. They have nothing to fear, nor shall they grieve.
The Holy Quran · Al-Baqara (The Cow) · 2:274