الكافي- ط الاسلامية, volume 3, page 367

1. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad, from Hammad from Hariz from Muhammad ibn Muslim who has said the following: “I once asked abu ’Abd Allah (a.s.), about a man who in Salah (prayer) sees a snake or scorpion; can he kill it if it is hurting? He (the Imam) said, ’Yes, he can do so.”’

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

2. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from Hammad ibn ‘Uthman from al-Halabiy who has said the following: “I once asked abu ‘Abd Allah (a.s.), about a man who kills, a bug, flea, lice or a fly while in Salah (prayer), does it invalidate his Salah (prayer) and Wudu’? He (the Imam) said, ’No, it does not do so.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

3. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from and Muhammad ibn al-Husayn from ‘Uthman ibn ‘Isa from Sama‘ah who has said the following: “I once asked him (the Imam) (a.s.), about a man who is standing in obligatory Salah (prayer) when he remembers his bag or property and he is afraid of loss or destruction of such items. He (the Imam) said, ‘He can discontinue his Salah (prayer) to secure such items then perform his Salah (prayer) again.’ I then asked him (the Imam), ‘What happens if he is in obligatory Salah (prayer) when a stumper (animal) or his stumper escapes and he is afraid of its getting lost or causing him difficulties?’ He (the Imam) said, ‘It is not harmful if he discontinues his Salah (prayer).”’

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

4. Al-Husayn ibn Muhammad has narrated from ‘Abd Allah ibn ‘Amir, from Ali ibn Mahziyar from Fadalah ibn Ayyub, from Aban from Muhammad who has said the following: “When Abu Ja‘far (a.s.), would see lice in Masjid he would cover it with sand.”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

5. Muhammad ibn ’Isma‘il has narrated from al-Fadl ibn Shadhan from Hammad ibn ‘Isa from Hariz from those who narrated to him who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘When you are in obligatory Salah (prayer) and see your slave escaping or your debtor who owes you a certain amount of property, or a snake because of which you are afraid for your life, you can discontinue your Salah (prayer) follow the slave or debtor or kill the snake.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.