Ta’anit Bechorot (Fast of the Firstborn)

It is an ancient and widespread custom for the firstborn to fast on the day before Passover. This commemorates the miracle which spared the firstborn Jewish sons from the plague which struck down the firstborn sons of the Egyptians.The firstborn of the Jews were saved in Egypt because they humbled themselves before God, admitting and declaring that all greatness, power, and sovereignty are His alone.