What changes had the followers of Prophet Muhammad (peace be upon him) made in the last days of Abu Ad-Darda' during the rule of `Uthman that Abu Ad-Darda' noted with anger?
 Narrated Salim:                     I heard Um Ad-Darda' saying, "Abu Ad-Darda' entered the house in an angry mood. I said to him. 'What makes you angry?' He replied, 'By Allah! I do not find the followers of Muhammad doing those good things (which they used to do before) except the offering of congregational prayer." (This happened in the last days of Abu Ad-Darda' during the rule of `Uthman) .