ENOfficial
Al-'Abbas said, "Messenger of God, we wish to sweep out Zamzam, but in it there are some of these jinnan," meaning small snakes; so God’s messenger ordered that they should be killed. Abu Dawud transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَن العبَّاسِ رَضِيَ اللَّهُ عَنْهُ قَالَ: يَا رَسُولَ اللَّهِ إِنَّا نُرِيدُ أَنْ نَكْنُسَ زَمْزَمَ وَإِنَّ فِيهَا مِنْ هَذِهِ الْجِنَّانِ يَعْنِي الْحَيَّاتِ الصِّغَارِ فَأَمَرَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بِقَتْلِهِنَّ. رَوَاهُ أَبُو دَاوُد
sunnah.com