What is the ruling on one who swore to a person that he would take a wage for work, and then the other swore that he would not take it?

Question : The sister, O Shaykh, says: A woman swore to her sister that she would teach her the Qur'an and take a wage, and the second woman swore that she would not take anything from her. What is required of them?

Answer : First, I advise my Muslim brothers not to be lax with oaths. For Allah the Exalted said: "And keep your oaths to Allah." Should not a person be lax with an oath or hasten in it? If one is tested and swears, let him say "if Allah wills," for whoever says "if Allah wills" does not break his oath. Whoever says "if Allah wills" does not break his oath. As for the answer to the question, we say: the right belongs to the one who swore first. The right belongs to the one who swore first, the woman. The one who swore first is the one who has the right, and the second one, who swore second, must expiate her oath, and nothing is required of her. For example, here, when the student came to the one who taught her, the teacher said, "By Allah, I will not take it." So the student said, "By Allah, you will take it."
The one who swore first is the teacher, so we say to the second one: do not force her, and expiate your oath with the expiation of an oath.
The easiest expiation of an oath in our time is feeding ten poor people. For each poor person, a kilo of food and with it meat, which is sufficient for him. If she wishes, she can gather ten poor people for dinner or lunch, and that is sufficient.