50 Heb “stretched.” Perhaps “his hand” should be supplied by ellipsis (see Ps 144:7). In this poetic narrative context the three prefixed verbal forms in this verse are best understood as preterites indicating past tense, not imperfects.
51 Heb “mighty waters.” The waters of the sea symbolize the psalmist’s powerful enemies, as well as the realm of death they represent (see v. 4 and Ps 144:7).
52 The singular refers either to personified death or collectively to the psalmist’s enemies. The following line, which refers to “those [plural] who hate me,” favors the latter.

In other versions

He sent from on high, he took me;

he drew me out of many waters.

He rescued me from my strong enemy

and from those who hated me,

for they were too mighty for me.

He reached down from on high and took hold of me;

he drew me out of deep waters.

He rescued me from my powerful enemy,

from my foes, who were too strong for me.

He reached down from on high

and took hold of me;

he pulled me out of deep water.

He rescued me from my powerful enemy

and from those who hated me,

for they were too strong for me.

He reached down from heaven and rescued me;

he drew me out of deep waters.

He rescued me from my powerful enemies,

from those who hated me and were too strong for me.

He reached from on high; he seized me.

He drew me from many waters.

He delivered me from my strong enemy,

and from those who hated me

because they were stronger than I.

He sent from above, he took me,

He drew me out of many waters.

He delivered me from my strong enemy,

And from them which hated me: for they were too strong for me.

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