Sa'id bin Jubayr (may Allah have mercy on him) said: We were with Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) at Arafah, and he said: "O Sa'id, why is it that I do not hear the people saying the talbiyah?" I said: They fear Sayyiduna Mu'awiyah (may Allah be pleased with him). So he came out of his tent and said: 'Labbayk Allahumma labbayk' (Here I am, O Allah, here I am), even if Mu'awiyah's nose be rubbed in the dust. O Allah, curse them, for they have abandoned the Sunnah out of hatred for Sayyiduna Ali (may Allah be pleased with him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9447