Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) says that once he was travelling with Sayyiduna Umar (may Allah be pleased with him) on the road to Makkah during his caliphate, and the Muhajirun and the Ansar were also with them. He recited a line of poetry in a melodious voice, and a man from Iraq said (there was no other Iraqi with them at that time): O Commander of the Believers! Let someone other than you say it. Sayyiduna Umar (may Allah be pleased with him) felt shy about that, and he urged his mount on until it was separated from the caravan.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9184