God promises to Abraham that through him, all the nations will bless themselves. God is so involved with man that He will even send an angel to wrestle with man, as Jacob does. We are told to not be unclean, and God will welcome us.
Through this time, we can see many Christophanies in the Old Testament: Abraham's sacrifice of Isaac, his chosen son, Melchizedek, the priest who offers sacrifice of bread and wine, the 3000 who died at the giving of the law prefiguring the 3000 saved at Pentecost.
It is through the promises of the Old Testament that the love of God, which will be fulfilled in the New Testament, is clear.