The Kitáb-i-Aqdas
108To none is it permitted to mutter sacred verses before the public gaze as he walketh in the street or marketplace; nay rather, if he wish to magnify the Lord, it behooveth him to do so in places as have been erected for this purpose, or in his own home. This is more in keeping with sincerity and godliness. Thus hath the sun of Our commandment shone forth above the horizon of Our utterance. Blessed, then, be those who do Our bidding.
Muttering sacred verses in public,   157, n135
Study Guide
Where is it not permitted to mutter the sacred verses?
Where are we “to magnify the Lord”?
(See Note 135)
What does Bahá’u’lláh stress the importance of?