'Do not laugh excessively, for excessive laughter kills the heart spiritually.'(As-Silsilah as-Saheehah) *Some scholars considered laughter without any reason to be a minor sin. The Prophet () said:
'Woe to you, do not laugh excessively, for excessive laughter kills the heart spiritually.' (Saheeh at-Targheeb) *The Prophet's 'laughter' was done through a simple smile. It is narrated that the Prophet () would sit with his companions and if something hilarious would be mentioned, he () would smile.' (Nasa'ee)
