I think the oath is not similar to the contract because the major ceremonial oath. Mainly used to say in front of the public, such as the President, it can bloom how to choptham the best don't cheat towards the country.
I think that the oath does not like the agreement because the oath was used in the ritual. Most use public speaking as president of the oath that the act may be best not corrupt the nation.
I think that the oath is not the same as the contract because the oath was used in ceremonial matters. Most words expressing such as president said oath'd best not corrupt and duty to the country.