Abu Ali al-Kahili (may Allah have mercy on him) narrates that Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) addressed us and said that the Messenger of Allah (peace and blessings be upon him) addressed us and said: "O people! Beware of shirk (associating partners with Allah), for it is more hidden than the creeping of an ant." Then someone whom Allah willed said: "O Messenger of Allah, how can we guard against it when it is more hidden than the creeping of an ant?" He (peace and blessings be upon him) said: "Say: 'Allahumma inna na'udhu bika an nushrika bika shay'an ta'lamuhu, wa nastaghfiruka lima la na'lam' (O Allah, we seek refuge in You from associating with You anything that You know of, and we seek Your forgiveness for what we do not know)."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated it from Abd al-Malik bin Abi Sulayman except Ibn Numayr, and it is narrated from Sayyiduna Abu Musa (may Allah be pleased with him) only through this chain."
Hadith Referenceالمعجم الأوسط / باب الحاء / 3479
Hadith Takhrij«أخرجه أحمد فى «مسنده» برقم: 19915، وابن أبي شيبة فى «مصنفه» برقم: 30163»