1)
Who will not die?
1.
Rashi: Keneses Yisrael says so; they will not die permanently, the way other nations do.
2.
Rashi (27): David. Radak - his enemies thought to kill him and eradicated him from the world.
3.
Malbim: Chizkiyah. He knew so, for Hashem cured him from his illness. Hashem spared him, so he will tell His deeds - "Lo ha'Mesim Yehalelu Kah" (115:17).
2)
Which deeds of Hashem will he tell?
1.
Radak: The wonders that He did with me.