Sayyiduna Ammar bin Yasir (may Allah be pleased with him) says: Whoever combines three traits has combined the traits of faith. One of his companions asked him: "O Abu al-Yaqzan! What are these traits about which you say that the Prophet (peace and blessings be upon him) said that whoever combines them has combined faith?" At that, Sayyiduna Ammar bin Yasir (may Allah be pleased with him) said: I heard the Prophet (peace and blessings be upon him) say: (that is, those traits are the following:) "Spending at the time of straitened means, being just from your own self, and greeting everyone with salam."
Al-Tabarani recorded it in al-Mu'jam al-Kabir. Its chain contains a narrator, al-Qasim Abu Abd al-Rahman, and he is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الإيمان / 184