to set one's heart on someone or something: to be bound to in a strong, chosen attachment, whether love, desire, or longing.
The word pictures the heart fastening onto something and holding on. Its oldest and most concrete use is physical joining, the silver bands that fasten the courtyard pillars of the tabernacle together (the second meaning below), and the sense of being attached to a person grows straight out of that image: to love someone this way is to be bound to them.
The attachment is strong and deliberate, not a passing feeling. It reaches from a man's consuming desire for a woman, to a builder's heart set on a great project, to God's own decision to fasten his love onto Israel for no reason except love itself.
This is why Deuteronomy's choice of the word is so striking. The same verb that describes raw human desire is turned toward God's choosing of his people, making that choice warm and personal rather than merely official. It sits close to the broad word for love (אָהַב) and to the clinging (דָּבַק) that Israel is told to show God in return, but it is more pointed than either: a chosen, exclusive fastening of the heart onto one object.
Nuances
How to read the verb where it describes God's choice of Israel (Deuteronomy 7:7 and 10:15): as the loyalty language of ancient political treaties, or as a deliberately affectionate, personally chosen attachment.
- minorityIt belongs to the loyalty vocabulary of ancient Near Eastern treaties, in which a ruler and his people bind themselves to one another in a relationship shown through service and obedience, so here it approaches a formal covenant commitment.; William L. Moran, "The Ancient Near Eastern Background of the Love of God in Deuteronomy," CBQ 25 (1963): 77-87; Moshe Weinfeld, Deuteronomy 1-11, Anchor Bible (1991)
- majorityIt is a deliberately affectionate, even erotic, and personally chosen attachment: the same verb used of Shechem's desire for Dinah and a soldier's desire for a captive woman is applied to God's love for Israel, giving the choice real emotional warmth rather than only legal loyalty. Wallis frames it as a committed attachment that is at once reasoned and passionate.; Gerhard Wallis, "chashaq," in Theological Dictionary of the Old Testament (TDOT) 5:261-266; Jon D. Levenson, The Love of God (Princeton University Press, 2016); Jacqueline E. Lapsley, "Feeling Our Way: Love for God in Deuteronomy," CBQ 65 (2003): 350-369; Deena Grant, "How to Love God," Journal of Interreligious Studies 26 (2019): 58-74
Whether the received Hebrew text of Isaiah 38:17 reads the verb meaning "loved" (chashaq) or should be corrected by one letter to a verb meaning "held back, spared" (chasak).
- minorityKeep the received text: Hezekiah says God clung to or loved his life so as to rescue it from the pit, a delivering love like that of Psalm 91:14.; Brevard S. Childs, Isaiah, OTL (2001)
- majorityCorrect it to the verb meaning "hold back, spare," a change of a single letter that yields a smoother sense: God held Hezekiah's life back from the pit of destruction.; J. J. M. Roberts, First Isaiah, Hermeneia (2015); Joseph Blenkinsopp, Isaiah 1-39, Anchor Bible (2000); Hans Wildberger, Isaiah 28-39, Continental Commentary (2002)