Worship as thus conceived became a legal transaction, in the course of which the god gave up his liberty in exchange for certain compensations whose kind and value were fixed by law. By a solemn deed of transfer the worshipper handed over to the legal representatives of the contracting divinity such personal or real property as seemed to him fitting payment for the favour which he asked, or suitable atonement for the wrong which he had done. If man scrupulously observed the innumerable conditions with which the transfer was surrounded, the god could not escape the obligation of fulfilling his petition;[*] but should he omit the least of them, the offering remained with the temple and went to increase the endowments in mortmain, while the god was pledged to nothing in exchange. * This obligation is evident from texts where, as in the poem of Pentauirit, a king who is in danger demands from his favourite god the equivalent in protection of the sacrifices which he has offered to that divinity, and the gifts wherewith he has enriched him. "Have I not made unto thee many offerings?" says Ramses II. to Amon. "I have filled thy temple with my prisoners, I have built thee a mansion for millions of years.... Ah if evil is the lot of them who insult thee, good are thy purposes towards those who honour thee, O Amon!" Hence the officiating priest assumed a formidable responsibility as regarded his fellows: a slip of memory, the slightest accidental impurity, made him a bad priest, injurious to himself and harmful to those worshippers who had entrusted him with their interests before the gods. Since it was vain to expect ritualistic perfections from a prince constantly troubled with affairs of state, the custom was established of associating professional priests with him, personages who devoted all their lives to the study and practice of the thousand formalities whose sum constituted the local religion. Each temple had its service of priests, independent of those belonging to neighbouring temples, whose members, bound to keep their hands always clean and their voices true, were ranked according to the degrees of a learned hierarchy. At their head was a sovereign pontiff to direct them in the exercise of their functions. In some places he was called the first prophet, or rather the first servant of the god--_hon-nutir topi_; at Thebes he was the first prophet of Amon, at Thinis he was the first prophet of Anhuri.[*] * This title of _first prophet_ belongs to priests of the less important towns, and to secondary divinities. If we find it employed in connection with the Theban worship, it is because Amon was originally a provincial god, and only rose into the first rank with the rise of Thebes and the great conquests of the XVIIIth and XIXth dynasties.