Authentic Supplication Number 168.

Abu Hurayrata `Umrah said: "When people would see the first of the fruits they used to bring them to the Messenger of Allah , then if the Messenger of Allah  would take it he woulld say: 'Allahumma barik lana fee thamarina, wa barik lana fee madeenatina, wa barik lana fee sa`ina, wa barik lana fee muddina (187), then he would give it to the youngest of little children that would come by."

Footnotes.
(187) O my ilah put blessings in our fruit for us, and put blessing in our town for us, and put blesing in our sa` [unit of measure for grain], and put blessing in our mudd [Measure of variuos standards: Bushel, or two pints].

Reporters .
Reported by Muslim. Al-Albani included this hadeeth in The Authentic of Good Sayings as #186.