Musnad Abu Ya'la al-Mawsili 42:309

Zuhayr narrated to us, Rawh ibn ‘Ubadah narrated to us, Husayn narrated to us, from Yahya ibn Abi Kathir, from Abu Sa‘id, the freed slave of al-Mahri, from Abu Sa‘id al-Khudri, who said: The Messenger of Allah (may Allah bless him and grant him peace) sent [an expedition] to Banu Lihyan. He said: "Let one out of every two men go forth, and the reward shall be shared between them." Then the Prophet of Allah (may Allah bless him and grant him peace) said: "O Allah, bless our *sa‘* (measure) and our *mudd* (measure), and grant us two blessings along with the blessing."