It wasnarrated that Abu 'Umar said:
"I heard Abu Juhaifah say: Goodfortune was mentioned in the presence of the Messenger of Allah (ﷺ)while he was performing prayer. A man said: 'so-and-so's fortuneis inhorses.' Another man said: 'So-and-so's fortune is incamels.' Anotherman said: 'So-and-so's fortune is in sheep.'Another man said: 'So-and-so's fortune is in slaves.' While theMessenger of Allah (ﷺ) wasfinishing his prayer, he raised his headat the end of the last Rak'ahand said: 'Allahumma Rabbanalakal-hamd mil' as-samawati wa mil' al-ard wa mil' ma shi'tamin shai'in ba'du. Allahumma la mani' limaa'taita wa lamu'ti lima mana'ta, wa la yanfa'u dhal-jaddi minkal-jadd(Allahhears those who praise Him. O Allah! O our Lord! To You is thepraiseas much as fills the heavens, as much as fills the earth and asmuchas You will after that. O Allah, there is none who can withholdwhatYou give, and none who can give what You withhold, and the goodfortune of any fortunate person is to no avail against You).' TheMessenger of Allah (ﷺ) elongated the word Jadd (fortune) so thatthey would know that it was not as they had said."
English reference: Vol. 1, Book 5, Hadith 879
Arabic reference: Book 5, Hadith 928