Riyad us-Salihin Hadith 382

I once entered the mosque in Damascus. I happened to catch sight of a young man who had bright teeth (i.e., he was always seen smiling). A number of people had gathered around him. When they differed over anything they would refer it to him and act upon his advice. I asked who he was and I was told that he was Mu'adh bin Jabal (May Allah be pleased with him) The next day I hastened to the mosque, but found that he had arrived before me and was busy in performing Salat. I waited until he finished, and then went to him from the front, greeted him with Salam and said to him, "By Allah I love you." He asked, "For the sake of Allah?" I replied, "Yes, for the sake of Allah". He again asked me, "Is it for Allah's sake?" I replied, "Yes, it is for Allah's sake." Then he took hold of my cloak, drew me to himself and said, "Rejoice,! I heard Messenger of Allah (ﷺ) saying, 'Allah, the Exalted, says: My love is due to those who love one another for My sake, meet one another for My sake, visit one another for My sake and spend in charity for My sake". [Malik].