Yazid bin Abu Ubayd reported,

I saw the mark of a blow on Salama's shin and asked, "Abu Muslim, what is this wound?"He replied, "This is a blow I received on the day of Khaybar. The people said, 'Salama has been struck.' So I went to the Prophet ﷺ, and he blew on it three times. I have not suffered any pain from it up to this very hour."

Azami 9709

Sahih

عن يزيد بن أبي عبيد قال

رأيت أثر ضربة في ساق سلمة فقلت: يا أبا مسلم ما هذه الضربة؟ فقال: هذه ضربة أصابتني يوم خيبر، فقال الناس: أصيب سلمة، فأتيت النبي ﷺ فنفث فيه ثلاث نفثات، فما اشتكيتها حتى الساعة.

الأعظمي 9709صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Biography of the Prophet ﷺ
Chapter
Miracles of the Prophet ﷺ and proofs of his prophethood
Section
Healing of Salama bin Akwa by the breath of the Prophet ﷺ
Numbering
Jami al-Kamil 9709 (2nd edition)
Azami 9709