Is every one who is killed in confrontation with the enemy called a martyr?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: If the Prophet (peace and blessings be upon him) did not bear witness to a specific person that he is in Paradise, can one say that a person killed in confrontation with the enemy, whether in the past or the present, is a martyr, since a martyr is among the people of Paradise?

Answer:
A martyr is one who is killed in the path of Allah in battle with the disbelievers, advancing and not retreating, and he is with the army of the Muslims, with the army of the Muslims, and under the leadership of the one in authority over the Muslims. This is the martyr. As for the one who kills himself and commits suicide, saying, "I will kill myself and kill the disbelievers," this is one who killed himself. And whoever kills himself, the Fire is obligatory for him, as in the hadith. This is a severe warning. Yes.