Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) said: "Whoever has an imam, the recitation of the imam counts as his recitation."
Al-Tabarani recorded it in al-Mu'jam al-Awsat. Its chain contains a narrator Abu Harun al-Abdi, and he is matruk (abandoned).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2649