Strong's Concordance

Original word: בָּל
Transliteration: bal
Definition (short): mind
Definition (full): anxiety, the heart

NAS Exhaustive Concordance

Word Origin: (Aramaic) from an unused word
Definition: the mind
NASB Translation: mind (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

(Aramaic) from bla'; properly, anxiety, i.e. (by implication) the heart (as its seat) -- heart.

see HEBREW bla'

KJV: Then the king, when he heard these words, was sore displeased with himself, and set his heart on Daniel to deliver him: and he laboured till the going down of the sun to deliver him.
NASB: Then, as soon as the king heard this statement, he was deeply distressed and set his mind on delivering Daniel; and even until sunset he kept exerting himself to rescue him.