The Prophet ﷺ said: A man's messenger sent to another indicates his permission to enter.  

أَنَّ النَّبِيَّ ﷺ قَالَ رَسُولُ الرَّجُلِ إِلَى الرَّجُلِ إِذْنُهُ  

The Prophet ﷺ said: When one of you is invited to take meals and comes along with the messenger, that serves as permission for him to enter. Abu 'Ali al-Lu'lu said: I heard Abu Dawud say: Qatadah did not hear anything from Abu Rafi'.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِذَا دُعِيَ أَحَدُكُمْ إِلَى طَعَامٍ فَجَاءَ مَعَ الرَّسُولِ فَإِنَّ ذَلِكَ لَهُ إِذْنٌ قَالَ أَبُو عَلِيٍّ اللُّؤْلُؤِيُّ سَمِعْتُ أَبَا دَاوُدَ يَقُولُ قَتَادَةُ لَمْ يَسْمَعْ مِنْ أَبِي رَافِعٍ شَيْئًا