NT.filter - kjv sincere:

kjv@Philippians:1:10 @ That ye may approve things that are excellent; that ye may be sincere and without offence till the day of Christ;

kjv@Philippians:1:16 @ The one preach Christ of contention, not sincerely, supposing to add affliction to my bonds:

kjv@1Peter:2:2 @ As newborn babes, desire the sincere milk of the word, that ye may grow thereby: