Does one sin by abandoning the means in the name of reliance upon Allah, and does one sin by abandoning medical treatment?

Question:
He says: Honorable Shaykh, may Allah grant you success, does one sin by abandoning the means in the name of reliance upon Allah, such as abandoning medical treatment, for example?

Answer:
Yes, one sins. Medical treatment is not obligatory; it is permissible. There is no harm in abandoning it; one may do it or leave it, because it is permissible. As for other matters that are not established as means of treatment, a Muslim may benefit from them or may not. But there are means, such as taking up arms, wearing armor, and wearing what protects a person from danger; a Muslim does not abandon these. The Prophet (peace and blessings be upon him) was the master of those who place their trust in Allah, and yet he wore armor.
And he carried weapons, may Allah’s peace and blessings be upon him. He acted upon the means and did not abandon them. Therefore, it is not permissible to abandon the means, and the one who abandons them has sinned. Yes.