Is there proof of an afterlife?

Answer 1

Like the belief in God, the belief in the existence of the afterlife rests upon tradition, not measurable proofs. You believe that it exists and live accordingly, or you reject it. The afterlife, and God, cannot be conclusively proven, in order to afford us free-will.

See also:

Indications that God exists

More information:

One of the central beliefs of Judaism, as stated in the Talmud (Mishna, Sanhedrin 11:1) and codified by Maimonides (1135-1204), is that the soul continues to exist and is treated in accordance with the person's actions while he or she was alive. This applies to all people, whatever their religion.
The Tanakh (Hebrew Bible) doesn't dwell at length on the afterlife; and nor does Judaism spend a lot of time speculating on its details. However, that is not meant to diminish from its importance. Rather, the Torah implies that we are to use the bulk of our energies in keeping God's ways in this world, with our feet firmly planted on Earth, while nonetheless not losing awareness of our beliefs.
Our ancient sages stated the importance of being aware of the next world: "This world is a mere entrance-hall before the afterlife" (Mishna, Avot ch.4).

All outstanding accounts are settled after this life. Some cases illustrate this point, since this entire world wouldn't be enough to reward a Moses or punish a Hitler. And while we're alive, knowledge of the future world serves as one of the motivations to keeping God's will.

The Tanakh does not delve into detail of the rewards of the righteous because religions could compete with more and more poetic promises. Also because belief in the afterlife was shared by all ancient societies and needed little reiteration. Besides, it would be like describing the colors of a sunrise to someone who was blind from birth.
It is, however, referred to briefly in Torah verses such as Genesis 15:15, which states that "You (Abraham) will come to your fathers in peace and will be buried in good old age." Coming to his fathers does not mean simply to be buried with them, since Abraham was not buried with his ancestors. Such verses are stated many times.
The prophets are more explicit with such references (see Isaiah 26:19 and 66:24, Daniel 12:13, Zechariah 3:7, 1 Kings 8:30, 2 Kings ch.2, Ecclesiastes 12:7). The afterlife is spoken of at length in the Talmud. More than 20 pages of Talmud (Sanhedrin 90-110, Rosh Hashanah 16-18, and other passages) are given to this subject.

See also:

The key beliefs of Judaism

How do you know there are a heaven and hell?

Answer 2

There is no proof of an afterlife.

Near-death experiences are sometimes cited as evidence of an afterlife, but there has been no report of a person who has actually died (brain death) communicating with the 'other side'. The experiences reported by those who have suffered near-death are inevitably coloured by the sociocultural context of the patient (Experiences Near Death: Beyond Medicine and Religion, by Allan Kellehear). This suggests that the Christian afterlife is experienced by Christians, but the Hindu afterlife is experienced by Hindus. Some have said that even when a person thinks he is about to die, he can have similar experiences (Depersonalization in Response to Life-threatening Danger, by Russell Noyes Jr and Roy Klette). Various conditions, such as oxygen deprivation or reduced blood flow, can induce similar experiences.

Answer 3

No. But, if I find proof, and if there is any way to communicate from the afterlife, I will amend this answer.