Ayyūb Al-Sakhtiyānī reports that Abū Qilābah – Allāh have mercy on him – said:

O Ayyūb, when Allāh brings about knowledge for you, bring about worship of him, and do not let your [sole] concern be to narrate it.

Ibn ʿAbd Al-Barr, Jāmiʿ Bayān Al-ʿIlm, article 1279.

It is reported that the inscription on the ring of Ḥusayn b. ʿAlī – Allāh be pleased with them – read:

You know, so now act (علِمت فاعمل).

Op. cit. article 1280.