Is the hadeeth “Differences of opinion among my ummah is a mercy” saheeh?

No File Exists
Check below answers in case you are looking for other related questions:
Is it Sunnah to cover the head when going to the toilet?
Good deeds appear in the form of a man in the grave

No File Exists
Related Answers:
False ahaadeeth about calligraphers and tailors
Ignoring a Person Who Offends You 100 Times
Soundness of  Hadeeth, “By hating the Arabs you would hate me”
Is it Sunnah to cover the head when going to the toilet?
Good deeds appear in the form of a man in the grave

Recommended answers for you:
The virtue of fasting six days of Shawwaal
Is there any difference between tahajjud and qiyaam al-layl?
Ruling on photographs
Things that invalidate the fast
Ruling on using the masbahah (prayer beads)