Aztec religion
Xiuhtecuhtli

Both Xiuhtecuhtli and Huehueteotl were worshipped during the festival of Izcalli. For ten days preceding the festival various animals would be captured by the Aztecs, to be thrown in the hearth on the night of celebration.

To appease Huehueteotl, the fire god and a senior deity, the Aztecs had a ceremony where they prepared a large feast, at the end of which they would burn captives; before they died they would be taken from the fire and their hearts would be cut out. Motolinía and Sahagún reported that the Aztecs believed that if they did not placate Huehueteotl, a plague of fire would strike their city. The sacrifice was considered an offering to the deity.

Xiuhtecuhtli was also worshipped during the New Fire Ceremony, which occurred every 52 years, and prevented the ending of the world. During the festival priests would march to the top of the volcano Huixachtlan and when the constellation "the fire drill" (Orion's belt) rose over the mountain, a man would be sacrificed. The victim's heart would be ripped from his body and a ceremonial hearth would be lit in the hole in his chest. This flame would then be used to light all of the ceremonial fires in various temples throughout the city of Tenochtitlan.
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