بم تميزت الدعوة السرية في مكة المكرمة

The secret call in Mecca was characterized by several features, the most important of which are:
1- The call was completely secret, as they used to hide to pray away from Mecca.
2- The Prophet initially invited his close relatives to enter Islam, and they embraced it. However, towards the end, the Quraysh found out because of the increasing number of people embracing Islam.