CROSS REF - Psalm 41:9

Even my close friend in whom I trusted,
Who ate my bread,
Has lifted up his heel against me.

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Commentary from Enduring Word (https://enduringword.com/bible-commentary/psalm-41/)

David’s woe was made more bitter because among his enemies were those who had once been a familiar friend to him. He knew what it was like when trusted friends – those he had close relationships with (who ate my bread) – betrayed him.

i. David was betrayed by his own son Absalom (2 Samuel 15) and by a trusted adviser named Ahithophel (2 Samuel 15:12 and 15:31). “What greater wound can there be than a treacherous friend?” (Trapp)

ii. In the ultimate and most sinister sense, this was fulfilled when Judas betrayed Jesus. Jesus specifically applied these words to Judas and his treachery. In John 13:18 Jesus quoted this phrase, but only the words He who eats bread with Me has lifted up his heel against Me. Some think Jesus deliberately left off the words in whom I trusted because He didn’t trust Judas. However, Jesus did make him the treasurer among the disciples (John 12:6 and 13:29).

iii. “The kiss of the traitor wounded our Lord’s heart as much as the nail wounded his hand.” (Spurgeon)

iv. “So these words were literally fulfilled in David, and yet the Holy Ghost, which dictated them, looked further in them, even to Christ and Judas, in whom they received a further and fuller accomplishment.” (Poole)

v. “The idiom ‘has lifted up his heel against me’ signifies a treacherous act (cf. Genesis 3:15; Psalm 55:12-14).” (VanGemeren)

vi. “Not merely turned his back on me, but left me with a heavy kick such as a vicious horse might give.” (Spurgeon)