John Gill Commentary Psalms 16:9

"Therefore my heart is glad, and my glory rejoiceth; My flesh also shall dwell in safety." — Psalms 16:9 (ASV)

Therefore my heart is glad
Because he had the Lord always in view; he was at his right hand, for his support and assistance, as well as because of what is expressed in the next verses: this is the same with rejoicing in spirit, (Luke 10:21) ; it denotes an inward joy, and fulness of it, because of the Lord's presence with him; see (Acts 2:28) ;

and my glory rejoices ;
meaning either his soul, which is the most glorious and noble part of man, as Aben Ezra, Kimchi, and Ben Melech interpret it; or rather his tongue, as in (Acts 2:26) ; the faculty of speaking in man being what gives him a superior glory and excellency to other creatures, and is that whereby he glorifies God; and so the word is often used in this book; see (Psalms 30:12) (57:8) (108:1) ; and here the phrase designs Christ's glorifying God, and singing his praise with joyful lips, among his disciples, a little before his sufferings and death;

my flesh also shall rest in hope ;
in the grave, which, as it is a resting place to the members of Christ, from all their sorrow, toil, and labour here; so it was to Christ their head, who rested in it on the Jewish sabbath, that day of rest, and that berth "in safety" ^F20 , as the word used may signify, and in of his resurrection from the dead, as follows.

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FOOTNOTES:

• F20: (xjbl) "in tuto", Tigurine version; "secure", Junius & Tremellius, Piscator, Cocceius; "in confidence", Ainsworth.