He allowed no one to oppress them;
    for their sake he rebuked kings:
¹⁵ “Do not touch my anointed ones;
    do my prophets no harm.”…

He called down famine on the land
    and destroyed all their supplies of food;
¹⁷ and he sent a man before them—
    Joseph, sold as a slave.
¹⁸ They bruised his feet with shackles,
    his neck was put in irons,
¹⁹ till what he foretold came to pass,
    till the word of the Lord proved him true.
²⁰ The king sent and released him,
    the ruler of peoples set him free.
²¹ He made him master of his household,
    ruler over all he possessed,
²² to instruct his princes as he pleased
    and teach his elders wisdom.

²³ Then Israel entered Egypt;
    Jacob resided as a foreigner in the land of Ham.
²⁴ The Lord made his people very fruitful;
    he made them too numerous for their foes,
²⁵ whose hearts he turned to hate his people,
    to conspire against his servants.
²⁶ He sent Moses his servant,
    and Aaron, whom he had chosen.
²⁷ They performed his signs among them,
    his wonders in the land of Ham.
²⁸ He sent darkness and made the land dark—
    for had they not rebelled against his words?
²⁹ He turned their waters into blood,
    causing their fish to die.
³⁰ Their land teemed with frogs,
    which went up into the bedrooms of their rulers.
³¹ He spoke, and there came swarms of flies,
    and gnats throughout their country.
³² He turned their rain into hail,
    with lightning throughout their land;
³³ he struck down their vines and fig trees
    and shattered the trees of their country.
³⁴ He spoke, and the locusts came,
    grasshoppers without number;
³⁵ they ate up every green thing in their land,
    ate up the produce of their soil.
³⁶ Then he struck down all the firstborn in their land,
    the firstfruits of all their manhood.
³⁷ He brought out Israel, laden with silver and gold,
    and from among their tribes no one faltered.
³⁸ Egypt was glad when they left,
    because dread of Israel had fallen on them.

³⁹ He spread out a cloud as a covering,
    and a fire to give light at night.
⁴⁰ They asked, and he brought them quail;
    he fed them well with the bread of heaven.
⁴¹ He opened the rock, and water gushed out;
    it flowed like a river in the desert.

⁴² For he remembered his holy promise
    given to his servant Abraham.
⁴³ He brought out his people with rejoicing,
    his chosen ones with shouts of joy;
⁴⁴ he gave them the lands of the nations,
    and they fell heir to what others had toiled for—
⁴⁵ that they might keep his precepts
    and observe his laws.

Praise the Lord.^[a] Psalm 105:16-45

While God kept the Israelites safe from being attacked by other kings He sent them famine. Why one and not the other?

He remembers his covenant forever,
    the promise he made, for a thousand generations,
⁹ the covenant he made with Abraham,
    the oath he swore to Isaac.
¹⁰ He confirmed it to Jacob as a decree,
    to Israel as an everlasting covenant:
¹¹ “To you I will give the land of Canaan
    as the portion you will inherit.”

¹² When they were but few in number,
    few indeed, and strangers in it,
¹³ they wandered from nation to nation,
    from one kingdom to another.
¹⁴ He allowed no one to oppress them;
    for their sake he rebuked kings:
¹⁵ “Do not touch my anointed ones;
    do my prophets no harm.” Psalm 105:8-15

Why do you think God chose Abraham Isaac and Jacob to make His covenant with?