Mark 1:11 New English Translation

¹¹And a voice came from heaven: “You are my one dear Son;^[a] in you I take great delight.”^[b]

Mark 1:11 tn Grk “my beloved Son,” or “my Son, the beloved [one].” The force of ἀγαπητός (agapētos) is often “pertaining to one who is the only one of his or her class, but at the same time is particularly loved and cherished” (L&N 58.53; cf. also BDAG 7 s.v. 1).
Mark 1:11 tn Or “with you I am well pleased.”sn The allusions in the remarks of the text recall Ps 2:7a; Isa 42:1 and either Isa 41:8 or, less likely, Gen 22:12, 16. God is marking out Jesus as his chosen one (the meaning of “[in you I take] great delight”), but it may well be that this was a private experience that only Jesus and John saw and heard (cf. John 1:32-33).

New English Translation (NET)