A man's invitation is his permission Al-Adab Al-Mufrad 1076
Arabic hadith text
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، قَالَ: حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ، عَنْ حَبِيبٍ، وَهِشَامٍ، عَنْ مُحَمَّدٍ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ: رَسُولُ الرَّجُلِ إِلَى الرَّجُلِ إِذْنُهُ.
Translation
Abu Hurayra reported that the Prophet, may Allah bless him and grant him peace, said, "A man's messenger to another man is his permission to enter."