[Machine] I heard the Prophet ﷺ saying, "Perform Umrah and Hajj together." So I informed Ibn 'Umar about it and he said, "He spoke the truth; I have heard the Prophet ﷺ saying the same." Then I met Anas and informed him about it, and he said, "They (the companions) know that better, but they do not like to act (upon that)." I asked Anas, "Had you done the same?" He replied, "Yes. And Allah's Messenger ﷺ said, 'Labbayka (i.e. I respond to Your call), O Allah, on behalf of 'Umrah and Hajj.'" (Sahih Muslim)
سَمِعْتُ النَّبِيَّ ﷺ يُلَبِّي بِالْعُمْرَةِ وَالْحَجِّ جَمِيعًا قَالَ فَحَدَّثْتُ بِذَلِكَ ابْنَ عُمَرَ فَقَالَ ابْنُ عُمَرَ إِنَّمَا أَهَلَّ بِالْحَجِّ وَحْدَهُ قَالَ فَلَقِيتُ أَنَسًا فَحدَّثْتُهُ بِقَوْلِ ابْنِ عُمَرَ فَقَالَ مَا يَعُدُّونَنَا إِلَّا صِبْيَانًا سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ لَبَّيْكَ عُمْرَةً وَحَجَّةً وَرَوَاهُ مُسْلِمٌ فِي الصَّحِيحِ عَنْ سُرَيْجِ بْنِ يُونُسَ عَنْ هُشَيْمٍ وَأَخْرَجَهُ الْبُخَارِيُّ مِنْ حَدِيثِ بِشْرِ بْنِ الْمُفَضَّلِ عَنْ حُمَيْدٍ