Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates: The Noble Prophet (peace and blessings be upon him) said: "Whoever performs prayer behind the Imam, the recitation of the Imam is considered as his recitation." Abu al-Hasan has transmitted this as a marfu' (attributed to the Prophet) hadith, and this is an error.
Hadith Referenceسنن الدارقطني / كتاب الصلاة / 1502
Hadith Takhrij«أخرجه مالك فى ((الموطأ)) برقم: 283، والبيهقي فى((سننه الكبير)) برقم: 2945، والدارقطني فى ((سننه)) برقم: 1502، 1503، وعبد الرزاق فى ((مصنفه)) برقم: 2814»