Wisdom 16:6 (WEB)
but for admonition were they troubled for a short time, having a token of salvation to put them in remembrance of the commandment of your law;
Catechism · 1
“Nevertheless, already in the Old Testament, God ordained or permitted the making of images that pointed symbolically toward salvation by the incarnate Word: so it was with the bronze serpent, the ark of the covenant, and the cherubim.” — Catechism footnote: Cf. Num 21:4-9; Wis 16:5-14; Jn 3:14-15; Ex 25:10-22; 1 Kings 6:23-28; 7:23-26.