Sayyidah Umm Anas al-Ansariyyah (may Allah be pleased with her) narrates: I came to the Messenger of Allah (peace and blessings be upon him) and said: "May Allah place you in the Highest Companionship (al-Rafiq al-A'la) of Paradise, and me with you." And I said: "O Messenger of Allah, teach me a righteous deed that I may do." He (peace and blessings be upon him) said: "Establish the prayer, for it is the best jihad; abandon sins, for that is the best emigration (hijrah); and remember Allah abundantly, for that is the deed most beloved to Allah with which you could meet Him."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21821