Psalms 141:2 - Joseph Benson’s Commentary on the Old and New Testaments

Let my prayer be set forth before thee Hebrews תכון לפניךְ, be directed to thy face, person, or presence. Let it not be lost, but let it come unto thee and find audience; as incense Let it be owned and accepted by thee, no less than if it had been offered with incense at thine altar, from which I am now banished, and so am prevented from offering it there. And the lifting up of my hands My prayer made with hands lifted up, which was the usual gesture in praying; as the evening sacrifice In which he instances rather than the morning sacrifice, either because this prayer was addressed to God in the evening, or because the evening sacrifice was more solemn than that of the morning, and was attended with more company and more prayers; whence the ninth hour, which was the time of this sacrifice, is emphatically called the hour of prayer, Acts 3:1.