Withhold not thou thy tender mercies from me, O Lord. The supplicatory portion of the psalm here commences. David beseeches God, whose loving-kindness is so great (Psalms 40:10), not to withhold from him those "tender mercies" which he lavishes so freely.
As he is bent on "not withholding," or "refraining," his lips (Psalms 40:9), so it is fitting that God should not "withhold," or "refrain'' ( כלא) his kindness. Let thy loving-kindness and thy truth continually preserve me (compare the last clause of Psalms 40:10).