All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad
is His slave and Messenger.
The meaning of Ja’ad in the Hadith refers to the build and physique - that is, a compact and muscular body - and not to curly hair, according to the preferred view of the scholars. Based on this, it can be concluded that Moosa
was Jaʿad in physique - meaning well-built and muscular - and Rajil ash-Shaʿar, that is, having smooth and straight hair. Hence, there is no contradiction between the two Hadiths.
Al-Nawawi
said in his commentary on Ṣaḥeeḥ Muslim:
“What is meant by Jaʿad here is the sturdiness and compactness of the body, not the curliness of the hair. As for the description of Moosa
as Jaʿad, the author of At-Taḥrir (an explanation of Sahih Muslim by Muhammad ibn Isma’il al-Asbahani) mentioned two possible meanings:
‘The first is what we mentioned regarding ʿEesa
that it refers to a sturdy body;
The second is curliness of the hair. The first meaning is the correct one, because it is authentically reported in the narration of Abu Hurayrah
in Sahih (sound) Hadith that he (Moosa) was Rajil al-Shaʿar (i.e., with straight hair).’” [End Quote]
Allah knows best.