Sahih Muslim , Book 30, Hadith 5789 (USC-MSA) ⓘ

Jabir b. Samura reported that there had appeared some whiteness on the front part of the head and beard of Allah's Messenger. When he applied oil, it did not become visible, but when he did not (apply) oil, it became apparent. And he had a thick beard. A person said: His face was as (bright) as the sword. Thereupon he (Jabir) said: No, it was round and like the sun and the moon. And I saw the seal near his shoulder of the size of a pigeon's egg and its color was the same as that of his body.

وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عُبَيْدُ اللَّهِ، عَنْ إِسْرَائِيلَ، عَنْ سِمَاكٍ، أَنَّهُ سَمِعَ جَابِرَ بْنَ سَمُرَةَ، يَقُولُ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم قَدْ شَمِطَ مُقَدَّمُ رَأْسِهِ وَلِحْيَتِهِ وَكَانَ إِذَا ادَّهَنَ لَمْ يَتَبَيَّنْ وَإِذَا شَعِثَ رَأْسُهُ تَبَيَّنَ وَكَانَ كَثِيرَ شَعْرِ اللِّحْيَةِ فَقَالَ رَجُلٌ وَجْهُهُ مِثْلُ السَّيْفِ قَالَ لاَ بَلْ كَانَ مِثْلَ الشَّمْسِ وَالْقَمَرِ وَكَانَ مُسْتَدِيرًا وَرَأَيْتُ الْخَاتَمَ عِنْدَ كَتِفِهِ مِثْلَ بَيْضَةِ الْحَمَامَةِ يُشْبِهُ جَسَدَهُ ‏.‏