The shortest chapter in Tehillim (Psalms) compiled by Dovid Hamelech, a"h, zt"l, consists of only two verses, and can be found in Chapter 117. It is appropriate for the messianic age, may that be soon, where all peoples acknowledge only Hashem. How wonderful and amazing that would be. Where idolatry will be a thing of the past. Where truth will be so clear to everyone. Where Hashem will be exalted by everyone and this will call for a true celebration. It is recited as part of Hallel, a collection of chapters 113-118.
א הַלְלוּ אֶת-יקוק כָּל-גּוֹיִם שַׁבְּחוּהוּ כָּל-הָאֻמִּיםב כִּי גָבַר עָלֵינוּ חַסְדּוֹ וֶאֱמֶת-יקוק לְעוֹלָם הַלְלוּקָהּ
Praise Hashem, all nations, extol Him, all peoples
For His Kindness overwhelmed us, and Hashem's truth is forever
Praise G-d!
