مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3183
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn 'Abbas (رضي الله عنه) said: The Messenger of Allah (ﷺ) said: “Two blessings that many people do not make good use of: free time and good Health."
Musnad Ahmad 3207lts ishad is saheeh, al-Bukhari (6412)]