The day’s portion (of manna) for its day was given to Israel in the morning very early. The portion was for use and nourishment during the whole day, but the giving and the getting of it was the morning’s work.
This suggests how greatly the power to spend a day aright, to abide all the day in Jesus, depends on the morning hour. If the first-fruits be holy, the lump is holy.
During the day there come hours of intense occupation in the rush of business or the throng of men, when only the Father’s keeping can maintain the connection with Jesus unbroken.
The morning manna fed all the day; it is only when the believer in the morning secures his quiet time in secret to distinctly and effectually renew loving fellowship with his Saviour, that the abiding can be kept up all the day.
From – “Abiding In Christ” by Andrew Murray