The Kitáb-i-Aqdas - The Most Holy Book
Index term: obligation, under Worship
k78.
O kings of the earth! He Who is the sovereign Lord of all is come. The Kingdom is God's, the omnipotent Protector, the Self-Subsisting. Worship none but God, and, with radiant hearts, lift up your faces unto your Lord, the Lord of all names. This is a Revelation to which whatever ye possess can never be compared, could ye but know it.
k184.
Say: O source of perversion! Abandon thy willful blindness, and speak forth the truth amidst the people. I swear by God that I have wept for thee to see thee following thy selfish passions and renouncing Him Who fashioned thee and brought thee into being. Call to mind the tender mercy of thy Lord, and remember how We nurtured thee by day and by night for service to the Cause. Fear God, and be thou of the truly repentant. Granted that the people were confused about thy station, is it conceivable that thou thyself art similarly confused? Tremble before thy Lord and recall the days when thou didst stand before Our throne, and didst write down the verses that We dictated unto thee -- verses sent down by God, the Omnipotent Protector, the Lord of might and power. Beware lest the fire of thy presumptuousness debar thee from attaining to God's Holy Court. Turn unto Him, and fear not because of thy deeds. He, in truth, forgiveth whomsoever He desireth as a bounty on His part; no God is there but Him, the Ever-Forgiving, the All-Bounteous. We admonish thee solely for the sake of God. Shouldst thou accept this counsel, thou wilt have acted to thine own behoof; and shouldst thou reject it, thy Lord, verily, can well dispense with thee, and with all those who, in manifest delusion, have followed thee. Behold! God hath laid hold on him who led thee astray. Return unto God, humble, submissive and lowly; verily, He will put away from thee thy sins, for thy Lord, of a certainty, is the Forgiving, the Mighty, the All-Merciful.
q106.
 
He is God, exalted be He, the Lord of majesty and power! The Prophets and Chosen Ones have all been commissioned by the One True God, magnified be His glory, to nurture the trees of human existence with the living waters of uprightness and understanding, that there may appear from them that which God hath deposited within their inmost selves. As may be readily observed, each tree yieldeth a certain fruit, and a barren tree is but fit for fire. The purpose of these Educators, in all they said and taught, was to preserve man's exalted station. Well is it with him who in the Day of God hath laid fast hold upon His precepts and hath not deviated from His true and fundamental Law. The fruits that best befit the tree of human life are trustworthiness and godliness, truthfulness and sincerity; but greater than all, after recognition of the unity of God, praised and glorified be He, is regard for the rights that are due to one's parents. This teaching hath been mentioned in all the Books of God, and reaffirmed by the Most Exalted Pen. Consider that which the Merciful Lord hath revealed in the Qur'án, exalted are His words: "Worship ye God, join with Him no peer or likeness; and show forth kindliness and charity towards your parents . . ." Observe how loving-kindness to one's parents hath been linked to recognition of the one true God! Happy they who are endued with true wisdom and understanding, who see and perceive, who read and understand, and who observe that which God hath revealed in the Holy Books of old, and in this incomparable and wondrous Tablet.