Sayyiduna Mus'ab bin Sa'd narrates from his father (Sayyiduna Sa'd bin Abi Waqqas, may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said something similar (to the previous hadith). When we examined it, we found Khalid bin Makhlad to be firmer, of better memory and more reliable than Bakr bin Bakkar, so we ruled in favour of the addition he narrated (the extra narrator in the chain). Abdullah bin Abd al-Quddus also narrated it from al-A'mash with another chain.