It is reported about Sayyiduna Abu Ayyub (may Allah be pleased with him) that he used to act contrary to Marwan bin al-Hakam in his prayer. Marwan asked him: What makes you do this? He said: I have seen the Prophet (peace and blessings be upon him) praying. If you pray in accordance with the way of the Prophet (peace and blessings be upon him), I will go along with you, and if you pray contrary to (his way), I will pray (by myself) and go back to my home.
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2346