A letter in which Albert Einstein dismisses the idea of God as a product of human weakness is being sold on eBay for a starting price of $US3 million ($2.94 million).
The letter, handwritten in 1954, a year before Einstein's death, was addressed to philosopher Eric Gutkind.
In it, Einstein discussed his views on religion, including calling "the Bible a collection of honourable but still primitive legends which are nevertheless pretty childish".
An anonymous collector who bought the letter in 2008 is putting it on sale on online auction site eBay from Monday.
The auction closes on October 18.
"With the interest in Einstein, along with the questions this (letter) touches on, we feel it is well worth the price," Eric Gazin, a spokesman for the sale, said.