Excessiveness in religion

It is narrated from the words of ‘Abdillah bni Mas’ud, may Allah be pleased with him: “The Messenger of Allah ﷺ said:

“Gone are those who show excessive severity / fastidious!” – and he repeated it three times! ”.

Muslim # 2670.

• Imam al-Nawawi writes, may Allah have mercy on him:

“That is: unnecessarily deepening, reaching extremes, crossing boundaries in their statements and in their actions!” – the end of the quote.

See Sharh Sahih Muslim, 220/16.