Jamieson, Fausset and Brown on Luke 1:10

10. praying without--outside the court in front of the temple, where stood the altar of burnt offering; the men and women in separate courts, but the altar visible to all.

the time of incense--which was offered along with the morning and evening sacrifice of every day; a beautiful symbol of the acceptableness of the sacrifice offered on the altar of burnt offering, with coals from whose altar the incense was burnt (Le 16:12, 13). This again was a symbol of the "living sacrifice" of themselves and their services offered daily to God by the worshippers. Hence the language of Psa 141:2; Re 8:3. But that the acceptance of this daily offering depended on the expiatory virtue presupposed in the burnt offering, and pointing to the one "sacrifice of a sweet-smelling savor" (Ep 5:2), is evident from Is 6:6, 7.