assalamualaikum

Abu Umamah reported' I came to Rasulullah s.a.w and said
' Order me to do a deed that will allow me to enter Jannah'.
Rasulullah s.a.w said' Stick to fasting as there is no equivalent to it'.
Then I came to him again and Rasulullah s.a.w said' Stick to fasting'.
This hadith related by Ahmad, an Nasai and al Hakim who classified it as sahih