مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1527
Musnad Abu Ishaq Sa'd bin Abi Waqqas
It was narrated from Yahya bin Sa"d, from Sa"d, that mention of the plague was made in the presence of the Messenger of Allah (ﷺ) and he said: "It is a punishment that befell those who came before you. If it is present in a land, do not enter it, and if you are in a land where it is, do not leave."
Musnad Ahmad 1527Sahih hadeeth; it is repeated (1491)]