While speaking about some of the people of Rhetoric (Ahlul Kalaam) who deny Allaah’s Attributes, Ibn Al-Qayyim said:
“How great a trial against Eemaan was this and its likes! And how great a crime this is against the sunnah and the Quraan! And how beloved to The Most Merciful in making jihaad against it with the heart, hand and tongue! And how heavy is the reward of that jihaad upon the scales.
Jihaad by way of knowledge-based arguments and the tongue takes precedence over jihaad by way of the sword and spears. This is why in the soorahs revealed in makkah, Allaah ordered this type of jihaad to be carried out in the form of warning and admonishing, such that there was no mention of jihaad by the hand. Allaah says:
“So do not obey the disbelievers, and wage jihaad with the utmost strength against them with it (the Quraan).” [25:52]
So jihaad by way of knowledge and arguments is the jihaad of His Prophets, Messengers and the elite few amongst His servants particularized with guidance, success and bounty. And whoever dies without having fought or without having spoken to himself about fighting, he dies upon a branch of hypocrisy.”
[See the explanation of “Al-Qaseedah An-Nooniyyah” by Sh. Muhammad Khaleel Harraas, 1/8]