(Not to be confused with Hector Zazou's song with the same title.)
French it's not my first language and trying to write the lyrics down by listening may not be a realistic option for me. Has anyone got them?
Update
The song was made for the 1989 TV series Bonne Espérance. My memory about its plot is very patchy. Jacques Beauvilliers has a farming estate called Bonne Espérance in south of Africa. He has 3 daughters and an illegitimate son Jean-Jacques with a slave. He catches them bullying him, he goes all protective about the boy (and the slave mother), while girls swear with blood to take revenge on the boy. Don't remember much after that. The boy grows up. Out of 3 girls, only one (I think Clara) still wants that revenge, reminding other 2 they swore it with blood.
Spoiler:
Clara arranges so Jean-Jacques gets killed. Jacques tells her the killer would be punished by death. She grows old and unhappy.