R. Akiva says: It need not be written (that eating meat and milk is forbidden), for it follows a fortiori, viz.: If the thigh sinew (gid hanasheh), which is not forbidden to be cooked, is forbidden to be eaten, then meat and milk, which is forbidden to be cooked, how much more so should it be forbidden to be eaten!
His Starting Point Was Not the Passover Offering
Mekhilta Tractate Kaspa 5:19