When Sayyiduna Abdullah bin Amir bin Kurayz (may Allah be pleased with him) conquered Khurasan, he said: I will show my gratitude to Allah by setting out from this very place in the state of ihram. So he entered ihram from Naysabur. When he came to Sayyiduna Uthman (may Allah be pleased with him), he blamed him for what he had done and said: If only you had kept to the miqat from which people enter ihram.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8933