Do not spend too much on food and instead focus on giving to charity and learning the Quran during Ramadan, this week's sermon tells worshippers.
"The Prophet was the most generous of all people and he was most generous during Ramadan," the sermon states.
Endowment, or waqf, is a way of spending generously that provides enduring good.
The sermon quotes a hadith by the Prophet Mohammed: "The rewards of the good deeds that will reach a believer after his death are knowledge which he taught and spread, a righteous son whom he leaves behind, a copy of the Quran that he leaves as a legacy, a mosque that he built, a house that he built for wayfarers, a canal that he dug, or charity that he gave during his lifetime when he was in good health. These deeds will reach him after his death."
Ramadan is a blessing from Allah, a time for forgiveness when worship and good deeds receive greater rewards."Our religion has pushed us to benefit from those seasons by hurrying to good practices which lead us to heaven," the sermon says.
Ramadan is when Muslims practice a key part of their faith - fasting. A gate of paradise is allocated exclusively for fasters.