It has been reported in Ajaaibul Ahkaam that the step-mother of a man got him murdered with the help of several other men.
When the case of the above mentioned murder was brought to Hazrat Omar (RA) who was the then Caliph, he wondered whether only one person was to be punished for that crime or all who were involved in it.
Hazrat Ali (A) who was present at that time in the court of Hazrat Omar (RA) asked him if several people had stolen a camel how many of them were to be punished by cutting their hands?
“I shall punish them all.” “Similar is this case,” said Hazrat Ali (A)
(Kafi -Tehzib -Qaza and Teha, p. 84).