Behold, he that keepeth Israel shall neither slumber nor sleep.  The LORD is thy keeper: the LORD is thy shade upon thy right hand.  Psalms 121:4-5

The same that is the protector of the church in general, is engaged for the preservation of every particular believer; the same wisdom, the same power, the same promises.  "He that keepeth Israel" (verse 4),  "is thy keeper" (verse 5).  The Shepherd of the flock is the Shepherd of every sheep, and will take care that not one, even of the little ones, shall perish.                   
                                                                                                                               Matthew Henry