Takhrij Hadith 1386: "“Shall I not tell you…"

“Shall I not tell you of the best of your deeds, the purest of them in the sight of your King, the highest of them in raising your ranks, and better for you than spending gold and silver, and better for you than meeting your enemy, striking their necks and them striking your necks?” They said: “Yes, indeed.” He ﷺ said: “The remembrance of Allah, Most High.”