Abdul-Rahman reported,

Someone other than Yunus bin Razin reported that he and his companions stopped at Rabadhah on their way to perform the Hajj. They were told, "Salama bin Akwa, the companion of the Messenger of Allah ﷺ, is here."So we went to him, greeted him, and questioned him. He said, "I gave my pledge of allegiance to the Messenger of Allah ﷺ with this very hand of mine," and he stretched out his palm to us, a large palm. We rose toward him and kissed both of his palms.

Ahmad 16551

Sahih

قال حدثنا يونس قال حدثنا العطاف قال حدثني

عبد الرحمن قال أبي

وقال غير يونس بن رزين أنه نزل الربذة هو وأصحابه يريدون الحج قيل لهم هاهنا سلمة بن الأكوع صاحب رسول الله ﷺ فأتيناه فسلمنا عليه ثم سألناه فقال بايعت رسول الله ﷺ بيدي هذه وأخرج لنا كفه كفا ضخمة قال فقمنا إليه فقبلنا كفيه جميعا

أحمد 16551صحيح
Contents
Reference
Commentary
Ayat
Collection
Musnad Ahmad
Book
Ibn Akwa in the additional appendix to the original
Numbering
Darussalam 16551
Ahmad 16551