Al-Bukhari reported: Ammar ibn Yasir, may Allah be pleased with him, said, “Whoever has three qualities will have completed the faith: fairness from yourself to others, offering peace to the world, and spending in charity even while poor.”

Source: Sahih Bukhari 28

Grade: Sahih (authentic) according to Al-Bukhari

عن البخاري قَالَ عَمَّارٌ ثَلَاثٌ مَنْ جَمَعَهُنَّ فَقَدْ جَمَعَ الْإِيمَانَ الْإِنْصَافُ مِنْ نَفْسِكَ وَبَذْلُ السَّلَامِ لِلْعَالَمِ وَالْإِنْفَاقُ مِنْ الْإِقْتَارِ

28 صحيح البخاري كِتَاب الْإِيمَانِ بَاب إِفْشَاءُ السَّلَامِ مِنْ الْإِسْلَامِ