It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "After the obligatory duties, the most beloved deed to Allah is to bring happiness to a Muslim."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith was narrated from Layth only by Sharik and Jarir, and Isma'il bin Amr is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 7911
Hadith Takhrij«أخرجه الطبراني فى «الكبير» برقم: 11079»