Sforno on Exodus 20:21/ספורנו על שמות כ׳:כ״א

1מזבח אדמה תעשה לי, you do not need to build elaborate temples for Me either, using precious materials. It suffices if you will erect an earthen altar. I am available to be prayed to and to respond.

2בכל המקום אשר אזכיר את שמי, at any lace which at one time or another I select to serve as such a place for communing with My servant. Compare Isaiah 12,4 הזכירו כי נשגב שמי, “declare that His name is exalted.

3אבא אליך וברכתיך, you do not need to employ artificial means made from silver or gold to attract My benevolent providence, for I can come to you anywhere and bless you when you but mention My name in prayer.