In the Hebrew Scriptures, the prophet’s call was an important event

Each of the three major prophets tell elaborate stories of their initiation
– typical features of a prophetic call include:
• a God-encounter
• instructions regarding their ministry and message
• a warning of what they are up against
• an attempt on the prophet’s part to dodge the call
◦ they argue their disqualification
• God rejects their disqualification and “qualifies” them
• they then receive their first vision, word, or revelation 
– Jeremiah begins with the story of his call and apprenticeship