{At early dawn} (orthrou batheos). Genitive of time.
Literally, at deep dawn. The adjective athus (deep) was often
used of time. This very idiom occurs in Aristophanes, Plato, et
cetera.  Joh 20:1  adds "while it was yet dark." That is, when
they started, for the sun was risen when they arrived ( Mr
16:2 ). {Which they had prepared} (ha h(8874)oimasan).  Mr 16:1 
notes that they bought other spices after the sabbath was over
besides those which they already had ( Lu 23:56 ).