It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: If any of you is invited and he comes along with the messenger, then this itself is permission for him.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 10894
Hadith Gradingحکم دارالسلام:إسناده حسن، أما قوله: اللهم إني أحبه فأحبه وأحب من يحبه صحيح، خ: 2122، م: 2421