Ibn Abi Hatim narrated that Ubayy bin Ka`b said that the Messenger of Allah said,

«إِنَّ اللهَ خَلَقَ آدَمَ رَجُلًا طُوَالًا كَثِيرَ شَعْرِ الرَّأْسِ كَأَنَّهُ نَخْلَةٌ سَحُوقٌ، فَلَمَّا ذَاقَ الشَّجَرَةَ سَقَطَ عَنْهُ لِبَاسُهُ فَأَوَّلُ مَا بَدَا مِنْهُ عَوْرَتُهُ، فَلَمَّا نَظَرَ إلى عَوْرتِه جَعَلَ يَشْتَدُّ فِي الْجَنَّةِ فَأَخَذَتْ شَعْرَهُ شَجَرَةٌ فَنَازَعَهَا، فَنَادَاهُ الرَّحْمنُ: يَا آدَمُ مِنِّي تَفِرُّ؟ فَلَمَّا سَمِعَ كَلامَ الرَّحْمنِ قَالَ: يَا رَبِّ لَا ولَكِنِ اسْتِحْيَاء»

(Allah created Adam Alaihi as-salaam tall, with thick hair, just as a date tree with full branches. When Adam ate from the forbidden tree, his cover fell off, and the first thing that appeared was his private area. When he saw his private area, he ran away in Paradise and his hair got caught in a tree. He tried to free himself and Ar-Rahman called him, 'O Adam! Are you running away from Me' When Adam Alaihi as-salaam heard the words of Ar-Rahman (Allah), he said, 'No, O my Lord! But I am shy.')