Hadith Narrated by Ubaidullah bin Abdullah bin Umar

Yahya related to me from Malik from Nafi that Ubaydullah ibn Abdullah ibn Umar sent a question to A'isha asking her, "May a man fondle his wife when she is menstruating?" She replied, "Let her wrap her waist-wrapper around her lower part and then he may fondle her if he wishes."

that his father said: "The Messenger of Allah (saw) was asked about water and how some animals and carnivorous beasts might drink from it. He said: 'If the water is more than two Qullahs, it will not become filthy.'" (Sahih)

that his father said: "I heard the Messenger of Allah (saw) being asked about water in the wilderness that is frequented by beasts and predators. The Messenger of Allah (saw) said: "If the water reaches the amount of two Qullah,* nothing can make it impure (Najis).'" (Sahih) Another chain with similar wording. *A Qullah is a large water container whose size the scholars differ over, from five to fifty waterskins. Tirmidhi said (no. 67): "And they say, it is approximately fifty Qirbah (water skins)." Khattabi said (Maalamus-Sunan: 1:35): "The scholars have stated that the size of two Qullah is five Qirbah." See Ahmad Shakir's comments on Jami At-Tirmidhi.

"The Messenger of Allah (saw) said: 'If the water is the amount of two or three Qullah, nothing can make it impure (Najis).'" (Sahih) Another chain with similar wording. (See hadith 517 for meaning of Qullah)