Abu Wa'il reported:I was sitting with 'Abdullah and Abu Musa that they reported Allah's Messenger (ﷺ) having said: Prior to the Last Hour, there would be a time when knowledge would be taken away, and ignorance would take its place and there would be bloodshed on a large scale

This hadith has been narrated on the authority of 'Abdullah (b. Mas'ud) and Abu Musa (al-Asha'ri) through other chains of transmitters

A hadith like this has been narrated on the authority of Abu Musa through another chain of transmitters

Abu Wa'il reported:I was sitting with Abu Musa and 'Abdullah and they were conversing with each other and Abu Musa reported Allah's Messenger (ﷺ) as saying (that we find in the above-mentioned ahadith)