Arcana Coelestia # 3039
3039. 'He will send His angel before you' means Divine Providence. This is clear from the meaning of 'angel' in the Word as the Lord, though which aspect of the Lord it is appears from the train of thought, as dealt with in 1925. The aspect meant here is clearly Divine Providence. The reason why the Lord is meant in the Word by 'angels' is that everything spoken in the Word through the Prophets and all others, though dictated by angels, is received from the Lord, that is, it is the Lord's Own. Angels in heaven also acknowledge and perceive that nothing good or true originates in themselves but in the Lord; indeed so great is their acknowledgement and perception that they turn away from everything that suggests any other idea. This explains why 'angels', that is to say, good ones, are used to mean the Lord, though which aspect of the Lord it is appears from the train of thought.
Arcana Coelestia # 1926
1926. That 'the angel of Jehovah' here is the interior thought which came from the Lord's Internal is clear, as stated, from the train of thought. Here the term interior is used to mean that with the Lord which was united to Jehovah, or His Internal. Union was not accomplished all at once but step by step, that is to say, from earliest childhood through to the last stage of His life in the world, above all by means of temptations and victories. Each temptation and victory brought about union and to the extent He united Himself with His Internal or Jehovah, thought became more interior, and intellectual truth more united to Divine Good. It is the thought such as this that is meant by interior thought flowing from the Lord's Internal and that is specifically represented and meant here by 'the angel of Jehovah'.