history - Is it true that Jews believed in sheol before the belief in hereafter entered into Judaism?

I have heard claimed that Jews first believed in Sheol as a place below the ground and was meant to be a place of eternal rest, free of any reward and punishment. However, in later periods and mostly during the exile new beliefs about the afterlife were introduced into Judaism. Thus Jews first believed in no hereafter or after life that could have any meaning of punishment or reward. They simply believed in a place called Sheol, which meant a place located below the ground, and all people whether righteous or unrighteous went there forever, and they believed there was no punishment or reward. During the exile, the belief in an afterlife found its way into Judaism.

Is such a claim true and right or valid? If so, would you please introduce some references about that to me?