Tafsiran Mazmur 27:13: Rashi & Radak

Had I not believed in seeing, etc. If I had not believed in the Holy One, blessed be He, those false witnesses would have already risen against me and destroyed me. [The word] לולא is punctuated for the homily which our Sages expounded (Ber. 4a): I know that You give reward to the righteous in the world to come, but I do not know whether I have a share with them or not.

In the land of the living: And he called the world to come, the land of the living, even though the soul does not have a place, all the more so a land. Rather, it is since the good of the world to come is compared to the Garden of Eden, which is a place in the world. In order to make the listeners understand, it is said by way of a metaphor, just like the punishment of the evil is called Gehinnom, which is a place in the world near Jerusalem. And it was a disgusting place, and all the impurities and carcasses were dumped there, and there was a constant fire there to burn the impurities and the bones of the carcasses. That is why the punishment of the wicked is called Gehinnom by way of a metaphor. So the reward of the righteous is called the Garden of Eden, which is the most desirable place in the world. And it is called, the land of the living, because Adam was penalized with death when he was expelled from there. And the words of our rabbis, may their memory be blessed (Berakhot 4a): Why do dots appear over were it not? (So) Said David before the Holy One, Blessed be He: Master of the Universe. I have every confidence in You that You grant an excellent reward to the righteous in the future to come, but I do not know whether or not I have a portion among them; perhaps [my] sin caused [that I should lose it].