It is narrated from Sayyiduna al-Dahhak bin Qays (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "When a man comes to a people and they say: Welcome, then there is welcome for him until the day he meets his Lord; and when a man comes to a people and they say to him 'Qahtan' (an unbefitting reception), then there will be qahtan for him on the Day of Resurrection."
Hadith Referenceالمعجم الكبير للطبراني / باب الضاد / 8105