How do we worship Lakṣmī on Fridays?

keep the home clean, light a ghee lamp in the evening, offer a lotus or red flowers and a white or sweet naivedya, and recite a Lakṣmī stotra.

Friday (Śukravāra) is linked with Śukra and with the Devī, and many homes — especially women — dedicate it to Lakṣmī. The underlying idea is simple: Lakṣmī is said to stay where there is cleanliness, harmony, honest work and generosity.

A common Friday routine: tidy and clean the house, especially the entrance and the mandir; draw a small rangolī at the door. In the evening light a ghee lamp before Lakṣmī, offer kuṅkuma, a lotus or red flowers, akṣata, and naivedya such as kheer, milk sweets or jaggery with chana. Recite the Śrī Sūkta, the Mahālakṣmī Aṣṭakam, or simply “Oṁ Śrīṁ Mahālakṣmyai namaḥ” 108 times. Many also keep the popular Vaibhava Lakṣmī vrata for a set number of Fridays.

Avoid quarrels that evening, and give something — food, a coin, help — to someone in need. That is Lakṣmī’s pūjā too.

Source: Śrī Sūkta (Ṛgveda khila); common practice · Mantra: Oṁ Śrīṁ Mahālakṣmyai namaḥ

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