مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1594
Musnad Abu Ishaq Sa'd bin Abi Waqqas
It was narrated from Muhammad bin Sa"d, from his father, that the Prophet (ﷺ) said: "The month is like this and likę this,” ten and ten, and nine once,
Musnad Ahmad 1595See the previous report]