Deut. 7:11 states: "You shall observe the commandment, and the decrees, and the ordinances, that I command you, today, to perform them."
The Torah writes about Earthly rewards, and not a lot about the world to come (afterlife) or the resurrection (see further in Deut. Ch.7:12-etc.)
One reason for this is the word "today" in Deut.7:11. The Torah is meant to be a guide to G-d's will in this world. This world was meant for us to work. As Rashi comments on the verse: "Today to perform them" - and tomorrow, in the world to come, to receive their reward. - (Rashi applying a quote from Talmud Eiruvin 22a)
If the Torah would focus on the next world, people would be distracted from their job in this world here and now; "today".
Another reason behind the focus on "today", is to show how G-d's word is true, and other religions are false. Although G-d does offer dual rewards in this world and in the next one; His focus in the Torah, is all about this world.
We have a saying. "He who wishes to lie, usually speaks of far away things."
A good liar will claim things that are not easily verifiable, but sound really good. Many world religions, have their priests/preachers, give sermons about the great rewards awaiting followers in the afterlife. Only G-d, removed almost all promises of an afterlife from his official book, and instead promises hard cold Earthly rewards as His focus. Look how fair G-d is to His followers. He offers a reward you can feel and touch. You will know if He keeps His word now; not after you are already dead. :)
Of course, the Tanach does talk about the afterlife and resurrection as a fact. Jewish people realize that the world to come plays a role in our belief system, and is more important than Earthly rewards. So, the Tanach will remind us of it. Here are some verses:
"...and Enoch walked with God, and he was not; for G-d had taken him."
Genesis 25:8 (and many places)
"And Abraham expired and died at a good old age, mature and content, and he was gathered to his people."
This terminology implies that Abraham would go on to his own afterlife with his family etc.
Kohelet (Eccl.) 12:7
12:1 "Remember now thy Creator in the days of thy youth, while the evil days come not, nor the years draw nigh, when thou shalt say, I have no pleasure in them."...12:5 ...because man goes to his long home, and the mourners go about the streets..."
12:7 "Then shall the dust return to the earth as it was: and the soul shall return unto G-d who gave it."
2 Samuel 12:23
22 And he said: 'While the child was yet alive, I fasted and wept; for I said: Who knoweth whether the L-rd will not be gracious to me, that the child may live?
23 But now he is dead, wherefore should I fast? can I bring him back again? I shall go to him, but he will not return to me."
It is interesting to read the entire event in 1 Samuel 28. Samuel specifically rises from his rest and informs King Saul that he would join him in the afterlife. In fact, one may consider why the Torah would forbid people from consulting the dead (Deut.18:11) if dead people cease to exist?
1 Samuel 28:19
"...tomorrow, you and your sons will be with me."
2 Kings 2:11
"....and Elijah ascended to heaven in a whirlwind."
Obviously, as someone else pointed out, Isaiah 26:19, and Daniel 12:2, are pretty straightforward as well.
"May your dead come to life, may my corpses arise. Awake and shout for joy, you who rest in the dirt."
"Many of those who sleep in the dusty Earth will awaken. These for everlasting life, and these for shame; for abhorrence."
Daniel himself is promised an afterlife:
"As for you, go to (your) end. You will rest, and you will arise, for your portion at the end of days."
Finally, it is interesting to note a couple of conversations brought in Talmud Sanhedrin, chapter Cheilek, 91a. Through the ages, there have been groups who deny the afterlife and resurrection. Mostly, it is because it is deemed illogical. However, Judaism finds it to be a very logical concept taught throughout our own Oral Torah. One reason is because it is in line with G-d's idea of true justice. Another is because it just seems that it would be natural for G-d to do so.
Ceasar asked Rabban Gamliel: Dead people become dirt. How can dirt live again? The daughter of Ceasar said, "Rabbi, let me handle this question." She asked her father: There are two potters in our town, one makes vessels using water and one uses clay. Which one is a greater craftsman? Ceasar answered, of course, the one who can form vessels out of water. She said, if G-d makes people out of an (original) drop of water, then certainly he can make people out of dirt!
A certain heretic once said to Geviah ben Pesissah (a Rabbi): Woe to you sinners who say that the dead will live! If the living must die, then the dead should certainly experience (continuous)death! Geviah answered: Woe to you sinners who deny! If people who never existed can live, then people who once lived can certainly live again!