Pastor Letsego of the Christ Embassy church reportedly captioned the picture “wife is away; it’s all yours tonight”, according to a report by the Daily Guide.
He is thought to have been sending it to his lover who is also a member of the church.
The development is said to have stunned members of the church who questioned why a pastor would distribute lewd pictures on Whatsapp.
When Pastor Letsego realised that he had sent the picture to the wrong recipient, he left the group, stopped answering his calls and killed himself the next day, the report said.
Prior to the incident, the pastor reportedly forged close bonds with a female member of the church whose name was given as Miriam.
He is said to have, however, denied that any amorous thing was going on between them.
It is not immediately clear if Miriam was the intended recipient of the damaging picture.