Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them) that he said: The Noble Prophet (peace and blessings be upon him) led us in eight and seven rak‘ahs together in Madinah (i.e., he combined Zuhr and Asr, and Maghrib and Isha prayers and performed them together).