Musar do Powtórzonego Prawa 15:14

In light of these things, let everyone who fears God and trembles before Him take to heart the sublimity and glory of prayer and the importance of praying with concentration. Fortunate is he who honors his Creator with his voice, with love and with concentration of the heart, and who ascribes to the Holy One Blessed is He — unity, sanctity and blessing. Concerning this was it written, “You shall surely give to him from your flock, from your threshing floor and from your winepress” (Devarim 15:14). The phrase, “from your flock,” alludes to the reciting the passages of the sacrifices before the morning service. One should have mind the verse, “And let us pay for [the offerings of] bullocks with [the prayers of] our lips” (Hoshea 14:3), as one recites them. The next phrase, “from your threshing floor (garnecha),” alludes to the prayers, praises and songs that one offers up with one’s throat (garon). Finally, in the phrase, “from your winepress (miyikvecha),” the middle letters form an acronym for the words: “unification” (yichud), “blessing” (berachah) and “holiness” (kedushah), as is mentioned in Tikkunei Zohart (Zohar Chadash 130a).