The Messenger of Allah (may Allah's peace and blessings be upon him) ordered to kill geckos, saying: They used to blow into [the fire] on Ibrahīm
Authentic hadithعن أم شريك رضي الله عنها : أن رسول الله صلى الله عليه وسلم أمرها بِقَتْلِ الأَوْزَاغِ وقال: «كان يَنْفُخُ على إبراهيم».
Umm Sharīk (may Allah be pleased with her) reported that the Messenger of Allah (may Allah's peace and blessings be upon him) ordered her to kill geckos and said: “They used to blow [the fire] on Ibrahīm."
Explanation
The Prophet (may Allah's peace and blessings be upon him) ordered to kill geckos, saying that they used to blow the fire on Ibrahīm to make it more intense. This implies that geckos are totally hostile towards devout monotheists.
Source · Narrated by Bukhari & Muslim
From the Hadith Encyclopedia (hadeethenc.com).