Ubaidullah bin Mua'dh عبيد الله بن معاذ بن معاذ بن نصر · Battles (Kitab Al-Malahim)

The prophet (ﷺ) passed by Ibn Sa’Id along with some of his companions. ‘Umar b. al-Kattab was among them. He was playing with boys near the fortress of Banu Maghalah. He was near the age of puberty (i.e. a boy). Before he was aware, the Messenger of Allah (ﷺ) gave him a pat on the back and said : Do you testify that you are the Messenger of Allah Ibn Sayyad then looked at him and said: I testify that…

We saw the last of Ibn Sayyad at the battle of the Harrah.