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Copy of a written Pact with the Devil by Christoph Haizmann from 1669.

Pact with the Devil is a cultural motif, best exemplified by the legend of Faust and the figure of Mephistopheles, but elemental to many Christian folktales. According to traditional Christian belief in witchcraft, the pact is between a person and Satan or a lesser demon. The person offers his or her soul in exchange for diabolical favours. Those favours vary by the tale, but tend to include youth, knowledge, wealth, fame or power.
Written pact consists in the same forms of attracting the demon, but includes a written act, usually signed with the conjurer’s blood.
It was usually thought that the person who had made a pact also promised the demon to kill children or consecrate them to the Devil at the moment of birth (many midwives were accused of this, due to the number of children who died at birth in the Middle Ages and Renaissance), take part in Sabbaths, have sexual relations with demons, and sometimes engender children from a succubus, or an incubus in the case of women.