Deuteronomy 16:3

Bread of affliction ; bread such as is prepared in circumstances of trial and pressure, when there is no time or opportunity for the application of all the means required for the preparation of bread of the better sort. The Israelites had in haste and amid anxiety to prepare the Passover meal on the evening of their flight from Egypt, and so had to omit the leavening of their bread; and this usage they had to observe during the seven days of the festival in subsequent times, to remind them of the oppression the nation had suffered in Egypt, and the circumstances of difficulty and peril amidst which their deliverance had been effected.