Hadith 8:2564
Abu Bakr narrated to us, he said: Waki’ narrated to us, from Ibn Abi Dhi’b, from Ibrahim, from Salim, from Ibn ‘Umar, that the Prophet (peace and blessings of Allah be upon him) combined the two of them at Jam’ (Muzdalifah), and he did not perform voluntary prayer between them.
حدثنا أبو بكر قال نا وكيع عن بن أبي ذئب عن إبراهيم عن سالم عن بن عمر أن النبي صلى الله عليه وسلم جمع بينهما بجمع ولم يتطوع بينهما