Did Muslims believe that Mohammad went into the hills to pray and spoke to God through an angel?

Yes, Muslims believe that the Prophet Muhammad often retreated to the hills, particularly to the Cave of Hira, to pray and reflect. During one of these retreats, he encountered the angel Gabriel (Jibril), who conveyed the first revelations from God. This event marks the beginning of Muhammad's prophethood and the revelation of the Quran, which Muslims regard as the literal Word of God.