Umar on Sincerity: Allah takes care of those who are sincere

‘Amir al-Sha’bi reported: Umar ibn Al-Khattab wrote to Abu Musa, may Allah be pleased with them both, saying, “Whoever purifies his intention, Allah will take care of his affairs between people. Whoever embellishes for people what Allah knows is not in his heart, Allah Almighty will disgrace him.”

Source: Ḥilyat al-Awliyā’ 1/50

عَنْ عَامِرٍ الشَّعْبِيِّ قَالَ كَتَبَ عُمَرُ إِلَى مُوسَى رَضِيَ اللَّهُ تَعَالَى عَنْهُمَا مَنْ خَلُصَتْ نِيَّتُهُ كَفَاهُ اللَّهُ تَعَالَى مَا بَيْنَهُ وَبَيْنَ النَّاسِ وَمَنْ تَزَيَّنَ لِلنَّاسِ بِغَيْرِ مَا يَعْلَمُ اللَّهُ مِنْ قَلْبِهِ شَانَهُ اللَّهُ عَزَّ وَجَلَّ

1/50 حلية الأولياء وطبقات الأصفياء