Arcana Coelestia#8485
8485. 'And they gathered it morning by morning' means the reception of good from the Lord unceasingly. This is clear from the meaning of 'gathering' - that is to say, the manna - as the reception of good, as above in 8467, 8472; and from the meaning of 'morning by morning', or every morning, as unceasingly. For 'morning by morning' implies every morrow, and 'the morrow' means what is eternal, 3998, thus also perpetually and unceasingly.
Arcana Coelestia#3998
3998. 'On the morrow' means into eternity. This is clear from the meaning of 'the morrow'. When yesterday, today, or tomorrow is mentioned in the Word eternity is meant in the highest sense, 'yesterday' meaning from eternity, 'today' eternity, and 'tomorrow' into eternity. As regards 'today' meaning eternity, see 2838. Indeed periods of time mentioned in the Word - ages, years, months, weeks, days, hours - mean states, as has often been shown. With the Lord however there are no states, but everything is eternal and infinite. From this it is evident that 'on the morrow' means into eternity.