Musannaf Ibn Abi Shayba 3:5266

Waki’ narrated to us, [he said] Al-A’mash narrated to us, from Sulayman ibn Maysarah and Al-Mughirah ibn Shibl, from Tariq ibn Shihab, from Salman, who said: The five prayers are expiations for what is between them, as long as the major sins are avoided.