it to be so: or, supply the Ellipsis by "[Me]". The Lord was now, and here, recognized by John (Joh_1:31-34).
thus. In fulfilling this duty.
it becometh us. This duty was incumbent on John as the minister of that Dispensation; likewise on the Lord: hence the word "thus". The reason is given in Joh_1:31.
all righteousness: or every claim of righteous duty. This was the anointing of Messiah (see note on Mat_3:17), and anointing was accompanied by washing or immersion (Exo_29:4-7; Exo_40:12. Lev_8:6).