The Shaykh Al-Albani's speech and explanation of the hadith (The one who killed a hundred souls).

The Shaykh : It is narrated in both Sahih al-Bukhari and Sahih Muslim from the hadith of Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: The monk referred to here is one who worships, but he is described as ignorant; he is a worshipper but not a scholar. He is righteous, but at the same time, he is ignorant. The full story confirms his ignorance. When this wretched man, who had killed ninety-nine souls without right, asked about the most learned person on earth to guide him to the path of repentance, he was directed to this monk. This was his first luck, but the matter is as he (peace be upon him) said in the hadith: He was directed to that monk, so he went to him and said to him: However, judging from the full context of the story, which is a parenthetical remark, even if it may be a bit long, this story is one of the very, very rare ones that can be said to be from the authentic Isra'iliyyat. The genuine Isra'iliyyat stories filled the books of Islamic history, the biographies of the prophets, and the stories of the prophets with many myths, absurdities, and falsehoods due to the Muslims' laxity in narrating them. Rarely is anything from them authentic unless it is through a path from one from whose mouth nothing but the truth comes, which is the Messenger of Allah (peace and blessings be upon him). This story is among the Isra'iliyyat that our Prophet (may Allah's prayers and peace be upon him) spoke about. It appears that this man was sincere in his repentance, and therefore, after he killed that ignorant monk, he continued to ask about the most learned person on earth. This time, he was directed to a scholar, and here is the point of the story. He came to him and said to him: Here is the point: So the man set out walking, and for a wisdom that Allah (Blessed and Exalted is He) willed, death came to him while he was on his way to the righteous village. The angels of mercy and the angels of punishment disputed over him. This dispute between the angels draws our attention to the fact that the angels, too, like humans, do not know the unseen; they do not know except what Allah (Mighty and Majestic) teaches them. The angels of punishment knew this man's previous life but did not know his afterlife, and the angels of mercy knew his afterlife. From here arose the dispute between the two groups, each claiming that it was their right to take charge of taking his soul. The complete hadith: The hadith ends.
The point of it, as is very clear, is that a righteous land influences its inhabitants with righteousness, and the opposite is the opposite. Therefore, it was part of that scholar's knowledge that he knew this man had killed a hundred souls, because he lived in a land whose people are wretched. So he said: "Get out of it and go to the village whose people are righteous."