Jami` at-Tirmidhi Book 47, Hadith 409
“When this Ayah was revealed: ‘Then on that Day, you shall be asked about the delights!’ the people said: ‘O Messenger of Allah! About which delights shall we be asked? For they are only the two black things, while the enemy is present and our swords are (at the ready) upon our shoulders?” He said: ‘But it is what shall come.’”
“When the following was revealed: Then on that Day, you shall be asked about the delights!’ Az-Zubair said: ‘O Messenger of Allah! Which are the delights that we will be asked about, when they (delights) are but the two black things: dates and water?’ He said: ‘But it is what shall come.’”
the Messenger of Allah said: “Indeed the first of what will be asked about on the Day of Judgment – meaning the slave (of Allah) being questioned about the favors – is that it will be said to him: ‘Did We not make your body, health, and give you of cool water to drink?’”