Be thou my strong habitation - Margin, as in Hebrew, “Be thou to me for a rock of habitation.” That is, a rock where I may safely make my abode, or to which I may resort and feel safe. In Psalms 31:2, this is, “Be thou my strong rock, for an house of defense to save me.” The idea is the same. See the notes at that passage, and compare the notes at Psalms 18:2.
Whereunto I may continually resort - Where I may take refuge at all times, in all circumstances of danger.
Thou hast given commandment to save me - There was some command, or some promise, on which the psalmist relied, or which he felt he might plead as the ground of his appeal. This may refer to some “special” promise or command made to the author of the psalm - and, if the psalm was composed by David, there were many such; or the reference may have been to the general commands or promises made to the people of God as such, which he felt he was at liberty to plead, and which all may plead who are the friends of God. “We” cannot refer, as David could, to any special promise made to “us” as “individuals;” but, in proportion as we have evidence of piety, we can refer to the promises made to alI the people of God, or to all who devote themselves to him, as a reason why he should interpose in our behalf. In this respect the promises made in the Scriptures to the children of God, may be pleaded by us “as if” they were made personally to ourselves, for, if we are his, they are made to us - they are intended for us.
For thou art my rock and my fortress - See the notes at Psalms 18:2.