Hawzah News Agency – Imam Husayn peace be upon him says:
دَخَلتُ عَلى رسولُ اللَّهِ صلى اللَّه عليه وآله وَعِندَهُ أُبي ابنُ كَعبٍ، فَقالَ لي رسولُ اللَّهِ صلى اللَّه عليه وآله مَرحَباً بِكَ يا أبا عَبدِاللَّهِ، يا زَينَ السَمَواتِ وَالأرَضينَ، قالَ لَهُ أبَيٌّ: وَكَيفَ يَكونُ يا رسولَ اللَّهِ صلى اللَّه عليه وآله زَينُ السَّماواتِ وَالأرَضينَ أحَدٌ غَيرُكَ؟! قالَ: يا أُبَيُّ وَالَّذي بَعَثَني بِالحَقِّ نَبيّاً إنَّ الحُسَينَ بنَ عَليٍّ في السَّماءِ أكبَرُ مِنهُ في الأرضِ، وَإنَّهُ لَمَكتوبٌ عَن يَمينِ عَرشِ اللَّهِ عزّ وجلّ: مِصباحُ هُدىً وَسَفينَةُ نَجاةٍ وَإمامٌ غَيرُ وَهنٍ وَعِزٌّ وَفَخرٌ وَعَلَمٌ وَذُخرٌ.
'I visited the Prophet (SAWA) when Ubayy ibn Kab was with him. The Prophet greeted me, saying, 'Welcome O Aba Abdillah, O the beauty of the heavens and the earths.' So Ubayy said, 'How is it possible, O Messenger of Allah, for anyone other than you to be the beauty of the heavens and the earths?' He said, 'O Ubayy I swear by Him who has rightfully sent me down as a messenger, certainly [the worth of] Husayn b. Ali is greater in the heavens than on the earth. And verily it is written [about him] on the right side of Allah's Throne: lamp of guidance, ark of salvation, an Imam, not weak, a [source of] dignity and pride, a landmark and a great treasure.'
Source: 'Uyun Akhbar al-Rida, v. 1, p. 59, no. 29