مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2322
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn ‘Abbas (رضي الله عنه) that the Prophet (ﷺ) said: "There are five, all of which are evil; the pilgrim in ihram may kill them and they may be killed in the Haram: mice, scorpions, snakes, vicious dogs and crows.”
Musnad Ahmad 2330Saheeh because of corroborating evidence; this is a da 'eef