Like many languages (but unlike Greek or Hebrew or English), Spanish uses a formal vs. informal 2nd person pronoun (a familiar vs. a respectful “you”). Spanish Bibles all use only the informal 2nd person pronoun (tú), with the exception of Dios Habla Hoy (DHH) (third edition: 1996) which also uses the formal pronoun (usted). In the referenced verses, the formal form is used.
Sources and for more information: P. Ellingworth in The Bible Translator 2002, p. 143ff. and R. Ross in The Bible Translator 1993, p. 217ff.