Muhammad bin Ishaq, in listing the names of the Ansar who were present at Badr, then from Banu Umayyah bin Zayd, mentions Uwaym bin Sa'idah - Ibn Ishaq did not give his lineage - and says: He was an ally of Banu Amr bin Awf, and it is also said that he was one of them himself.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14419
It is narrated from Sayyiduna Uwaym bin Sa'idah al-Ansari (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) came to them in the Masjid of Quba' and said: "Allah, the Mighty and Majestic, has praised you greatly for purification in connection with your masjid. What is this purification by which you purify yourselves?" They said: "O Messenger of Allah! We know of nothing, except that we had some Jewish neighbours who used to wash their backsides after relieving themselves, so we began washing just as they washed."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14420
It is narrated from Sayyiduna Uwaym bin Sa'idah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Indeed, Allah chose me and chose companions for me, and from among them He made for me ministers, helpers and in-laws. So whoever reviles them, upon him is the curse of Allah, the angels and all of mankind; on the Day of Resurrection no ransom and no compensation will be accepted from him."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14421
Sayyiduna Uwaym bin Sa'idah (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) said: "Marry virgins, for they are sweeter of speech, more fertile of womb, and more content with little."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14422
Sayyiduna Uwaym bin Sa'idah (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) rebuked a man who had a Persian bow and said: "Throw it away." Then he pointed to the Arab bow and said: "With this and with the spear, Allah will establish you firmly in the lands and help you against your enemy."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14423