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The customs of Shabbat Shalom and Jumma Mubarak both share a common thread of reverence for the day of rest or worship.
In Judaism, Shabbat (Friday evening to Saturday evening) is a day of rest and spiritual rejuvenation, while in Islam, Friday (Jumma) is considered a sacred day for congregational prayer and worship.
Both traditions emphasize the importance of setting aside time for spiritual reflection, community, and connection with the divine.

Historically, Friday has been considered a significant day in many spiritual and mystical traditions.
In ancient Mesopotamia, Friday was associated with the goddess Ishtar, who represented love, fertility, and war.
In Christianity, Friday is often associated with the crucifixion of Jesus Christ.
In Islam, Friday is considered the day of congregational prayer, and it's believed that the day holds a special blessing and spiritual significance.

The cosmic significance of Friday can be attributed to its association with the planet Venus, which is often linked to themes of love, harmony, and spiritual growth.
In many esoteric traditions, Friday is considered a day for spiritual growth, self-reflection, and connection with the divine feminine.

The alignment of these customs highlights the shared human desire for spiritual connection, community, and transcendence, regardless of the specific tradition or faith.

I hope this provides a deeper understanding of the significance of Friday in various spiritual traditions.