One of the main sources of dispute during his lifetime and continuing since then is Mirza Ghulam Ahmad 's use of the terms `` Nabi '' ( `` prophet '' ) when referring to himself .
One of the main source of dispute during his lifetime and continuing since then , is Mirza Ghulam Ahmad 's use of the terms `` Nabi '' ( prophet ) and `` Rasool '' ( messenger ) when referring to himself .