A man asked The Prophet (Sallallähu alaihi wa sallam): “Which Jihad has the highest reward?”
He replied: “(Jihad) In which the remembrance of Allah is done excessively.”
The man asked: “Among those fasting, who has the highest reward?”
He replied: “The one who remembers Allah excessively.”
Then similarly, Zakat, Hajj and Sadaqah all were mentioned, and for each of them, The Prophet (Sallallähu alaihi wa sallam) kept on saying that the highest reward will be for the one who remembers Allah excessively (in all these deeds).
Abu Bakr Radiyallahu 'anhu said to 'Umar Radiyallahu 'anhu: “O Abu Hafsah! Those who remember Allah have taken away all the virtues.”
The Prophet (Sallallähu alaihi wa sallam) said: “You are absolutely right!”