Council of Basel 1431-45 A.D.

[That the electors of a pope before entering the conclave shall swear that, if one of them is elected, he will observe the said decrees]'
 
So that the aforesaid may be put into execution the more easily, the holy synod determines that the electors of a Roman pontiff are bound, before entering the conclave, to swear to God and to promise the church that, should one of them be chosen as pope, he will observe the above decrees, statutes and ordinances, and to the best of his ability will endeavour to fulfil them really and effectively adding that whoever in future years shall be chosen as Roman pontiff must swear, among the other things which he must profess according to the decree of the council of Constance beginning Since the Roman pontiff, effective observance of the present decree. Later, in his first public consistory, he is bound to make again the same profession and let him also profess that, if he violates what is contained in this decree or commits a notorious crime which scandalizes the church, he will subject himself to the judgment of a general council. Both he and the college of cardinals shall insert this profession in the letters which they customarily send throughout the world on the accession of a new pope.
 
[That this decree should be published in synods]
So that nobody may plead ignorance of this wholesome and necessary decree, the holy synod orders, in virtue of holy obedience, all metropolitan bishops to have this decree read and published in provincial and synodal councils, and superiors of religious to have it read and published in their general chapters.
 
Since prelates should be such as is described above, those with the right of electing them should be very careful that they make a worthy election in the presence of God and of the people, and let them be most solicitous to elect such persons as can fill so great an office. Let them remember that if they act in so important an affair either fraudulently or carelessly or without regard for the fear of God, they will be the authors and cause of evil pastors and will therefore share in the penalties which the evil pastors themselves will suffer in the severe judgment of God. Since the endeavour of human fragility can effect nothing without the help of almighty God, from whom every good endowment and every perfect gift comes down, those in whose hands lies the election of a pontiff or an abbot shall meet in church on the day of the election in order to hear with great devotion a mass of the holy Spirit, whom they will humbly petition to deign to inspire them to elect a worthy pastor. The more devoutly they approach the act of election, the more readily they will merit that grace, so let them confess and reverently receive the sacrament of the Eucharist. When they have entered the place of the election of any prelate who is to be chosen through election, they shall swear in the hands of the president of the chapter, and the president in the hands of his immediate subordinate, in these words: I, N. , swear and promise to almighty God and to such and such a saint (according to the dedication of the church) to elect the person who I believe will be the more useful to the church in spiritual and temporal things, and not to give a vote to anyone who I think is procuring the election for himself by the promise or gift of some temporal thing, or by making a request in person or through another, or in any other way directly or indirectly. He who appoints a procurator to elect a certain person shall take the same oath and shall confess and communicate; so also shall a procurator with a general mandate for election in matters in which by common law he can be appointed a procurator in the business of such an election. The oath shall be taken also by those who may have made an agreement about the election of a future prelate, and they too are obliged to confess and to communicate. If they do not do so, for that occasion they shall be deprived by law of the power of electing. Thereupon let them elect to the said prelacy a man of lawful age, of serious character and adequate education, already in sacred orders and suitable in other respects in accordance with canonical regulations.

If the election is made in another way and of a different kind of person than the above or by the wickedness of simony, the election shall be invalid and null by law.