Mishkat al-Masabih 10 The Rites of Pilgrimage كتاب المناسك 52

وَعَنِ ابْنِ عَبَّاسٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ «هَذِهِ عُمْرَةٌ اسْتَمْتَعْنَا بِهَا فَمَنْ لَمْ يَكُنْ عِنْدَهُ الْهَدْيُ فَلْيَحِلَّ الْحِلَّ كُلَّهُ فَإِنَّ الْعُمْرَةَ قَدْ دَخَلَتْ فِي الْحَجِّ إِلَى يَوْمِ الْقِيَامَةِ» . رَوَاهُ مُسْلِمٌ وَهَذَا الْبَابُ خَالٍ عَنِ الْفَصْلِ الثَّانِي

Ibn ‘Abbas reported God’s messenger as saying, “This is an ‘umra which we have treated as a complete observance, so those who have no sacrificial animals may come completely out of the sacred state, for the ‘umra has become incorporated in the hajj till the day of resurrection.” Muslim transmitted it.