Musnad Ahmad 1156:263

Abu Mu'awiyah narrated to us, he said: Layth narrated to us, from 'Ata', from Umm Salamah, she said: I wore a necklace in which there were strands of gold. She said: The Messenger of Allah, peace and blessings of Allah be upon him, saw it and turned away from me. He said: "What makes you feel secure that Allah will not place around your neck, in its place on the Day of Resurrection, strands of fire?" She said: So I took it off.