From the Bible:
By the sweat of your brow you shall eat bread, until you return to the ground, from which you were taken;For you are dust, and to dust you shall return. – Gen 3:19
My son, shed tears for one who is dead, with wailing and bitter lament; As is only proper, prepare thebody, and do not absent yourself from the burial. – Sirach 38:16
Or are you unaware that we who were baptized into Christ Jesus were baptized into His death? We wereindeed buried with Him through baptism into death, so that, just as Christ was raised from the dead by theglory of the Father, we too might live in newness of life. – Romans 6:3-4
We do not want you to be unaware, brothers, about those who have fallen asleep, so that you may notgrieve like the rest, who have no hope. For if we believe that Jesus died and rose, so too will God, throughJesus, bring with him those who have fallen asleep. – 1 Thess 4:13-14