According to the word that I covenanted with you when ye came out of Egypt, so my spirit remaineth among you: fear ye not.
According to the word that I covenanted with you when ye came out of Egypt - literally, (I am with you), 'the word (or thing) which I covenanted' - i:e., I am with you as I covenanted with you when ye came out of Egypt (Exodus 19:5-6; Exodus 24:10-11). The covenant-promise of God to the elect people at Sinai is an additional motive for their persevering. The Hebrew х kaarat (H3772)] for to "covenant" is, literally, to cut, alluding to the sacrificial victims cut in ratification of a covenant. So - or, and, connecting "I am with you" (Haggai 2:4) and "my Spirit remaineth among you;" "according to the word that I covenanted with you" being in a parenthesis.
My Spirit remaineth among you - to strengthen you for the work (Haggai 1:14; Zechariah 14:6). The inspiration of Haggai and Zechariah at this time was a specimen of the presence of God's Spirit remaining still with His people, as He had been with Moses and Israel of old (Ezra 5:1; Isaiah 63:11).