Tawhid
And when Luqman said to his son, advising him, “O my son, do not associate anything with Allah. Truly, associating others with Him is a great injustice.”
31:13And (remember) when Luqman said unto his son, when he was exhorting him: O my dear son! Ascribe no partners unto Allah. Lo! to ascribe partners (unto Him) is a tremendous wrong -