عَنْ أُبَيِّ بْنِ كَعْبٍ رَضِيَ اللَّهُ عَنْهُ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ ذَكَرَ الدَّجَّالَ، فَقَالَ: ((إِحْدَى عَيْنَيْهِ كَأَنَّهَا زُجَاجَةٌ خَضْرَاءُ (وَفِي رِوَايَةٍ عَيْنُهُ خَضْرَاءُ كَأَنَّهَا الزُّجَاجَةُ)) وَتَعَوَّذُوا بِاللَّهِ تَبَارَكَ وَتَعَالَى مِنْ عَذَابِ الْقَبْرِ))
It is narrated from Sayyiduna Ubayy ibn Ka'b (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) mentioned the Dajjal and said: One of his eyes will be like a green glass, and you should seek Allah's protection from the punishment of the grave.