It is narrated from Sayyiduna Ammar (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) used to give the salam to his right and to his left: 'As-salamu alaykum wa rahmatullah' (Peace be upon you and the mercy of Allah).
No one narrated this hadith from Abu Ishaq (may Allah have mercy on him) except Abu Bakr (may Allah have mercy on him).
Hadith Referenceالمعجم الأوسط / باب الألف / 925
Hadith Takhrij«أخرجه ابن ماجه فى «سننه» برقم: 916، والدارقطني فى «سننه» برقم: 1347، والبزار فى «مسنده» برقم: 1395، والطحاوي فى «شرح معاني الآثار» برقم: 1599»