The Most weighted action!
Ummul Mu’mineen Juwairiyareports that Allah’s Messenger came out from (her apartment) in the morning while she was busy in observing her dawn prayer in her place of worship. He came back in the forenoon and she was still sitting there. He ﷺ said to her: “have you been in the same seat since I left you?” She said: “Yes.” Thereupon Nabi Muhammad ﷺsaid:“I recited four words three (3) times after I left you and if these are to be weighed against what you have recited since morning these would outweigh them” and these words are:
اللہِ وَ بِحَمْدِہٖ ، عَدَدَ خَلْقِہٖ ، وَ رِضَا نَفْسِہٖ وَ زِنَۃَ عَرْشِہٖ ، وَ مِدَادَ کَلِمَاتِہٖ
Exalted be Allah and praise is due to Him, according to the number of His creation and according to the pleasure of His Self and according to the weight of His Throne and according to the ink (used in recording) words (for His Praise).”(S. Muslim: 4905 … Abu Dawud: 1505)