The Book of Asceticism · Hadith 138 (#Ḥadīth #16)
Chapter 8 | What has come in Reference to this World and One who Seeks it
محمد بن أبي عمير عن علي الأحمص عمن أخبره عن أبي جعفر عليه السلام انه كان يقول: نعم العون الدنيا على الآخرة.
16.Muḥammad ibn Abī ʿUmayr narrated from ʿAlī al-Aḥmaṣ, from the one who informed him of it, from Abū Jaʿfar who used to say, “How good a helper this world is for the Hereafter [if it is approached correctly].”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).