Al A’la V.1-19
He has certainly succeeded who purifies himself [Al A’la:14]
The one who attains success is the one who purifies himself from all falsities in his life. There are three aspects to purity, in regards to Allah, it would be purifying Allah’s names, attributes, and worship from shirk’ (associating partners). The Prophet (SAW) brought the complete religion, and purifying it would be by not adding any innovations to the deen. Purification with people would be the way we deal with them, by not showing any grudges or mistreatment.