תהלים, פרק קי״ה, פסוק י׳

After calling upon the entire nation to place their trust in God, the message turns specifically to His holy ones [אבן עזרא]. This distinct group is made up of the priests and the Levites [רד״ק, מאירי]. They receive a separate call to trust in God because of their unique closeness to Him. Since they stand before God and serve Him constantly, they are encouraged to trust that their ongoing service will truly bring them benefit [רד״ק].

This focused address also reflects a difference in spiritual standing. The priests and Levites possess a higher level of faith and spiritual elevation compared to the rest of the people. Because of this deeper trust, they are rewarded with a more personal, specialized level of divine providence, help, and protection than the general population receives [מלבי״ם].