King James Version (KJV)
When thou liest down, thou shalt not be afraid: yea, thou shalt lie down, and thy sleep shall be sweet.
Modern English
If you lie down, you will not be afraid; when you lie down, your sleep will be sweet.
Hebrew
אִם תִּשְׁכַּ֗ב לֹ֥א תִפְחָ֑ד וְ֝שָׁכַ֗בְתָּ וְעָרְבָ֥ה שְׁנָתֶֽךָ׃
ʾim tishkab loʾ tipḥad vshakabta vʿarbah shnateka