Hazrat Abu Huraira, may Allah be pleased with him, narrates that the Holy Prophet, peace and blessings of Allah be upon him, said:
“Should I not suggest to you that by which Allah obliterates sins and elevates the ranks [of a person].” They [the hearers] replied, “Yes, Messenger of Allah.”
He said, “Performing the ablution thoroughly, despite difficulties, increasing the number of steps towards the mosque and waiting for the next prayer after observing a prayer, for that is mindfulness.”
(Sahih Muslim)