Instead of relying on God's rest, teh people looked to their foreign allies to rescue them and givethem rest.
God promised a Messiah that would bring rest to the people:
Isaiah 28:16-18
16 So this is what the Sovereign Lord says:
“See, I lay a stone in Zion, a tested stone,
a precious cornerstone for a sure foundation;
the one who relies on it
will never be stricken with panic.
17 I will make justice the measuring line
and righteousness the plumb line;
hail will sweep away your refuge, the lie,
and water will overflow your hiding place.
18 Your covenant with death will be annulled;
your agreement with the realm of the dead will not stand.
When the overwhelming scourge sweeps by,
you will be beaten down by it.
But no peace would be found in these faulty treaties. The people wold end p crushed and beaten down. God pronounced judgement on Israel, not to break them down but to bring them back.
Isaiah 28:29 All this also comes from the Lord Allmighty, whose plan is wonderful, whose wisdom is magnificent