Talmud su Salmi 140:14

Rebbi Joshua ben Levi said, he who is about to pray has to sit down twice. Once before he prays and once after he prays. Before he prays, (Ps. 84:5) “Hail to those who sit in Your house.” Once after he prays, (Ps. 140:14) “But the righteous will thank Your name, the upright ones will sit before You.²⁵Under the influence of the tradition given in the next paragraph, the parallel of the Babli (32b) requires in the name of R. Joshua ben Levi that one sit in the synagogue one hour each before and after prayer. “One hour” probably means “some time.” The argument given here is that in Ps. 84 there is no qualification for those in God’s house, but in Ps. 140 this is restricted to the righteous, those who have fulfilled their obligation in praying.”