وَحَدَّثَنِي مُحَمَّدُ بْنُ حَاتِمٍ، حَدَّثَنَا بَهْزٌ، حَدَّثَنَا وُهَيْبٌ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ طَاوُسٍ، عَنْ أَبِيهِ، عَنِ ابْنِ عَبَّاسٍ، - رضى الله عنهما - قَالَ كَانُوا يَرَوْنَ أَنَّ الْعُمْرَةَ فِي أَشْهُرِ الْحَجِّ مِنْ أَفْجَرِ الْفُجُورِ فِي الأَرْضِ وَيَجْعَلُونَ الْمُحَرَّمَ صَفَرً وَيَقُولُونَ إِذَا بَرَأَ الدَّبَرْ وَعَفَا الأَثَرْ وَانْسَلَخَ صَفَرْ حَلَّتِ الْعُمْرَةُ لِمَنِ اعْتَمَرْ ‏.‏ فَقَدِمَ النَّبِيُّ صلى الله عليه وسلم وَأَصْحَابُهُ صَبِيحَةَ رَابِعَةٍ مُهِلِّينَ بِالْحَجِّ فَأَمَرَهُمْ أَنْ يَجْعَلُوهَا عُمْرَةً فَتَعَاظَمَ ذَلِكَ عِنْدَهُمْ فَقَالُوا يَا رَسُولَ اللَّهِ أَىُّ الْحِلِّ قَالَ ‏"‏ الْحِلُّ كُلُّهُ ‏"‏ ‏.‏
Translation
Abu Jam at al-Dubu'i reported

I performed Tamattu' but the people dis- couraged me to do so. I came to Ibn 'Abbas and asked him about it. He ordered me to do so. I came to the House (Ka'ba) and slept. I saw a visitant in the dream who said: 'Umra is acceptable and so is the Hajj performed for God's sake. I came to Ibn Abbas and informed him about that Which I saw in the dream whereupon he said: Allah is the Greatest, Allah is the Greatest This is the Sunnah of Abu'l-Qasim (the Holy Pro- phet) (ﷺ).