When he came to the Prophet ﷺ in Medina, the Messenger of Allah ﷺ said to him, "Come close to me." So he drew near, and the Prophet ﷺ placed his hand on his forelock, ran his hand over it, invoked blessings upon him, and made supplication for him.
أخبرنا إبراهيم بن المستمر العروقي قال حدثنا الصلت بن محمد قال حدثنا غسان بن الأغر بن حصين النهشلي قال
لما قدم على النبي ﷺ بالمدينة فقال له رسول الله ﷺ ادن مني فدنا منه فوضع يده على ذؤابته ثم أجرى يده وسمت عليه ودعا له
No references are available.
[hasan] Tabarani related it in Kabir 4/30, hadith no. 3558, 3559, from the hadith of Ghassan, through him, and it is in Kubra, hadith no. 9331. The hadith has corroborating witnesses in meaning.