The teaching of
Prophet Mohamed
(Pbuh) at last aroused the anger of a powerful party of Koreish . Being the guardian of the Kabba's national idols , that party feared that they would be compromised in the eyes of other tribes once they were to allow such heresy to be openly taught by one of their number . Accordingly , they began to persecute the Prophet (Pbuh) and his followers , especially after the death of Abu Talib and Khadija
To escape this persecution , Mohamed (Pbuh) fled to the neighboring city of Medina . The Higera (or flight as the word signifies) occurred in 622 AC and was considered by the Muslims as such an important event in the history of their religion that they adopted it as the beginning of a new era , from which , dates the Islamic Calendar (Hijri) .