Shaykhul-Islaam Ibn Taymiyyah (d. 728H) - rahimahullaah - said:
"Worship (al-'Ibaadah) is obedience to Allaah by following that which He ordered upon the tongues of His Messengers."
He also said:
"Worship (al-'Ibaadah) is a comprehensive term covering everything that Allaah loves and is pleased with - whether saying or actions, outward and inward."
[Majmoo' al-Fataawaa (10/149) of Ibn Taymiyyah]
"Worship (al-'Ibaadah) is obedience to Allaah by following that which He ordered upon the tongues of His Messengers."
He also said:
"Worship (al-'Ibaadah) is a comprehensive term covering everything that Allaah loves and is pleased with - whether saying or actions, outward and inward."
[Majmoo' al-Fataawaa (10/149) of Ibn Taymiyyah]
