Psalm 2:7
5 Then he angrily speaks to them and terrifies them in his rage, saying, 6 “I myself have installed my king on Zion, my holy hill.” 7 The king says, “I will announce the Lord’s decree. He said to me: ‘You are my son. This very day I have become your father. 8 Ask me, and I will give you the nations as your inheritance, the ends of the earth as your personal property. 9 You will break them with an iron scepter; you will smash them like a potter’s jar.’”
Targum Psalm 2:7
5 Then he will speak to them in his strength, and in his wrath he will frighten them. 6 I have anointed my king, and appointed him over my sanctuary. 7 I will tell of the covenant of the Lord. He said: “You are as dear to me as a son to a father (abba), pure as if this day I had created you.” 8 Ask me and I will give the riches of the Gentiles as your inheritance, the rulers of the ends of the earth as your holding. 9 You will shatter them as with a rod of iron, like a potter’s vessel you will break them.
Notes and References
"... Aside from the opening citation and the reference to the ‘leather belt’, Mark 1:11 is the only other instance in the prologue where a scriptural source is certain. But again, identifying the source is no easy task. The words spoken by the heavenly voice – ‘You are my son, the beloved; with you I am well pleased’ – are definitely scriptural in origin. The first clause contains a clear reference to LXX Psalm 2:7 – ‘You are my son’ – a passage which is elsewhere associated with messianic expectation. The origin of the appellation ‘the beloved’, however, is obscure. Whilst the common adjective ‘beloved’ was often used to describe filial or divine–human relations – or perhaps both in the case of Mark 1:11 – many have suspected a scriptural source. It could have its roots in the interpretation of Psalm 2:7, which is expanded in the Targum: ‘You are as beloved to me as a son to a father’ (Targum Psalm 2:7). Another possibility is that it comes from a famous passage concerning sonship, the Aqedah, in which Isaac is repeatedly referred to as ‘[Abraham’s] beloved son’ (LXX Genesis 22:2; also Genesis 22:12, 16) ..."
Vette, Nathanel Writing with Scripture: Scripturalized Narrative in the Gospel of Mark (pp. 122-123) T&T Clark, 2022