मासातीते तु नित्ये हि पुनश्चोपनयं चरेत् । ईशो गौरीगुहो विष्णुर्ब्रह्मा चेंद्र श्च वै यमः ३१ ।
If one omits Sandhyā for a month one has to be re-invested with the sacred thread. For the sake of prosperity deities shall be propitiated such as Īśa, Gaurī, Guha. Viṣṇu. Brahmā, Candra (the moon) and Yama.
One shall sit firmly with the mind in concentration and perform the Gāyatrī Japa after due obeisance to all gods. He shall not omit the practice of the Praṇava mantra.
Understanding the oneness of the individual soul (Jiva) and the Supreme Brahman, one should practice the recitation of the Pranava (Om). He is the creator of the three worlds, the sustainer of creation, and the imperishable, eternal (Achyuta).