The two great covenant-character words stand together in one text: "It is of Jehovah's lovingkindnesses that we are not consumed, because his compassions fail not. They are new every morning; great is thy faithfulness" (Lam 3:22–23): chesed behind "lovingkindnesses," emunah behind "faithfulness".
"Though the covenant seemed to be broken, they owned that it still continued in full force; and, though Jerusalem be in ruins, the truth of the Lord endures for ever." — Matthew Henry, Commentary on the Whole Bible (1710), on Lamentations 3:22.
Chesed is the refrain of Psalm 136, twenty-six times, "for his lovingkindness endureth for ever," rendered by the LXX's eleos and echoed in Luke 1's songs. Emunah is the firmness of Habakkuk 2:4, "the just shall live by his faith" (KJV; the ASV has "the righteous shall live by his faith"), the line the New Testament quotes three times (Rom 1:17; Gal 3:11; Heb 10:38). Both workbenches are one click away: chesed, H2617 and emunah, H530. Sources: ASV and KJV (PD); Matthew Henry, Commentary on the Whole Bible (1710); MannaFest's research index.