In this year, twelve men of Yathrib, of whom ten were of the Jewish tribe of Khazraj and the other two of Aws, came to Mecca and took an oath of fidelity to the Prophet at AlAqaba, a hill on the north of that city. This oath was called the Womens' Oath, not that any women were present at this time, but because a man was not thereby obliged to take up arms in defense of the Prophet or his religion, it being the same oath that was afterwards exacted of the women. This oath was as follows: "We will not associate anything with Allah; we will not steal nor commit adultery or fornication, nor kill our children (as the pagan Arabs used to do when they apprehended that they would not be able to maintain them), nor forge calumnies; we will obey the Prophet in everything that is reasonable, and we will be faithful to him in well and sorrow." When they had solemnly engaged to do all this, the Prophet sent one of his disciples, Musab Ibn Umair, home with them to teach them the fundamental doctrines and ceremonies of the religion. Mus'ab, having arrived at Yathrib by the assistance of those who had been formerly converted, gained several new converts, particulary Usaid Ibn Khudair, a chief man of the city, and Sad Ibn Mu'adh, prince of the tribe of Aws. Islam spread so fast that there was scarcely a house that did not have some Muslims in it.