It is narrated from Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with them) that he said: The greatest liar is the one who swears a false oath, and in reality, the miser is the one who is miserly in greeting (salam), and the greatest thief is the thief of prayer.
Hadith Referenceالادب المفرد / كتاب السلام / 1041
Hadith Gradingالألبانی:ضعيف الإسناد موقوفًا
Hadith Takhrij«ضعيف الإسناد موقوفًا : تفرد به المصنف بهذه التمام»
It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him), he said: The most miserly of people is the one who is miserly in greeting (salaam), and the most incapable and helpless is the one who is even incapable of making supplication (du'a).
Hadith Referenceالادب المفرد / كتاب السلام / 1042
Hadith Gradingالألبانی:صحيح الإسناد موقوفًا و صح مرفوعًا
Hadith Takhrij«صحيح الإسناد موقوفًا و صح مرفوعًا : صحيح ابن حبان (ابن بلبان) ، حديث : 4498»