Prophet Muhammad (Sallahu Alayhi Wasallam) said,
"I met prophet Ibrahim (AS) on the night journey (through the heavens) and he said to me, 'O Muhammad (Sallahu Alyahi Wasallam), give my salaam to your ummah and tell them that Jannah is a wide plain with pure soil and sweet water. And the plants grow there by saying 'Subhan Allah, Alhamdulillah, La lilaaha ilAllah, Allahu Akbar'."
(Trimidhi)