उमामहेश्वरव्रतं—पञ्चाक्षरमन्त्रस्य माहात्म्यं, न्यासः, जपविधिः, सदाचारः, विनियोगः
रुलेस् फ़ोर् फ़ोओद् अन्द् अ मेअल् शूद्रान्नं यातयामान्नं नैवेद्यं श्राद्धमेव च गणान्नं समुदायान्नं राजान्नं च विवर्जयेत्
rules for food and a meal śūdrānnaṃ yātayāmānnaṃ naivedyaṃ śrāddhameva ca gaṇānnaṃ samudāyānnaṃ rājānnaṃ ca vivarjayet
Regarding rules for food and one’s meal, one should avoid: food obtained from a Śūdra (i.e., food not ritually fit for one’s observance), stale or kept-over food, food that is an offering (naivedya), food connected with śrāddha rites, food meant for a group-feast, food from a communal distribution, and food from the king’s table. Such restraint preserves purity for Śiva-worship and steadies the aspirant’s discipline on the path where the paśu is freed from pāśa by the grace of Pati.
Suta Goswami (narrating Shiva-dharma and vrata discipline to the sages at Naimisharanya)
It lays down āhāra-niyama (dietary restraints) to maintain ritual purity and inner steadiness, supporting effective Linga-puja and vrata observance.
Implicitly, Shiva is Pati—the liberating Lord—whose worship requires disciplined purity so that the Pashu (individual soul) can loosen Pāśa (bondage) through regulated conduct.
Vrata-based Shiva-puja supported by food-discipline (āhāra-śuddhi), a practical limb that stabilizes Pashupata-style sādhanā and preserves the sanctity of worship.