Musannaf Ibn Abi Shaybah

Hazrat Tariq narrates that we went for Hajj. While we were on the way, one of us, who was in the state of Ihram, crushed a monitor lizard under his foot. Then he came to Hazrat Umar so that you may give a verdict regarding it. Hazrat Umar said to him, "Bring another judge with you." So both of them decided on such a goat which gathers both water and tree (i.e., it grazes and drinks water, not so young that it only survives on milk). Then Hazrat Umar recited the blessed verse: { یَحْکُمُ بِہٖ ذَوَا عَدْلٍ مِّنْکُمْ }, (Let two just men among you judge).