Shaikh ul-Islam Ibn Taymiyyah (rahimahullaah) said, "Ibadah is a collective term for everything that Allaah loves and is pleased with from amongst sayings and inward and outward actions.
He also said, "Ibadah is obedience to Allaah by carrying out what He has commanded through tongues of His Messengers.
Fudayl ibn Ayyaad, a taabi'ee, said regarding the verse {...that He may test you, which of you is best in deeds...} [11:7], "The most sincere and the most correct" so those who were around him said "And what is the most sincere and the most correct?" He replied "Action, if it is correct but not sincere will not be accepted and action, if it is sincere but not correct will not be accepted until it is both sincere and correct. Sincere means that nothing but the Face of Allaah is sought and correct means that it is in conformity with the Sunnah."
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