What does worship (^Ibadah) mean? 

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Worship is the ultimate submission and humility, as described by Hafidh al-Subkiyy.   Suratul-Anbiya’ Ayah 25 means, “No one is God except Allah, so worship Him alone.” The Prophet, sallallahu ^alayhi wa sallam, said, “The greatest right due to Allah from His slaves is for them to worship Him without associating partners with Him.” (Related by al-Bukhariyy and Muslim)