based on the main article, 'Jehovah'
Jehovah is the first stage in our understanding of God. Primitive ancient people didn't fully understand God's compassion like Christians do today. Why is that?
Ancient people depended on the sun, rain, weather, plants, and animals for survival. They believed that the reason for natural disasters, drought, contagious diseases, locusts, etc., was because they did something wrong and God was punishing them. The ancient Israelites feared Jehovah because they lacked the understanding Jesus had about the compassion of God 'the Father'.
To avoid punishment, ancient people looked for ways to make Jehovah happy through sacrifice. Leviticus 23:19,20; 1 Samuel 16:5-7. To be blessed by Jehovah, obedience to his laws was required. Deuteronomy 30:15-20; Isaiah 1:19; Deuteronomy 8:20.
In cases of serious wrong doing, willful lawbreakers were executed to protect the purity of the tribe. Leviticus 20:10; Numbers 15:30, 31. The belief was that if someone violated God's law within their tribe, Jehovah could punish everyone. God's people could not risk crop failures, deadly diseases, floods and other natural disasters. The survival of the tribe was far more important than individual rights and freedom.
From the perspective of primitive ancients who depended on God's blessings for their survival as a tribe, Jehovah was to be feared.
Today, like in ancient times, believers in Jehovah still fear him. He's a god of righteousness, and a god of judgment for those who disobey. It is very easy to displease this ancient God. Nahum 1:2; Numbers 11:1; 1 Kings 13:26; Haggai 1:12; Isaiah 65: 11,12.
To better understand the difference, look at these two articles.