A.T. Robertson Commentary Acts 10:4

"And he, fastening his eyes upon him, and being affrighted, said, What is it, Lord? And he said unto him, Thy prayers and thine alms are gone up for a memorial before God." — Acts 10:4 (ASV)

Lord (κυριε). Cornelius recognizes the angel of God (verse 3) as God's messenger.

Are gone up (ανεβησαν). Timeless second aorist active indicative of αναβαινω. Gone up like the smoke of incense in sacrifices.

For a memorial (εις μνημοσυνον). Old word from μνημων. The only other instance in the N.T. is by Jesus about the act of Mary of Bethany (Matthew 26:13). His prayers and his alms proved his sincerity and won the ear of God.