Explanation of hadith #16 in the Heart Therapy Series:

The Messenger salla Allahu alayhi wa sallam said: (The one whom Allah did not put in their heart mercy towards people has perished and is in loss)
Reported by al-Dulabi in al-Kuna and Abu Na‘im in al-Ma‘rifah and ibn ‘Asakir in Tarikh Dimashq and decalred to be hasan by al-Albani (al-Silsilah al-Sahihah 456)
قالَ رسول الله ﷺ: (خابَ عَبدٌ و خَسِرَ لَمْ يَجعَل اللهُ تعالى في قلبِهِ رَحْمَةً لِلبَشَرِ)
رواه الدولابي في الكنى وأبو نعيم في المعرفة وابن عساكر في تاريخ دمشق وحسنه الألباني (السلسلة الصحيحة 456