שמות פרק טו, יז פָעַלְתָ ה' מ קְדָש אֲד' כּוֹנֲנוּ יָדֶיך
מסכת כתובות דף ה/א דרש בר קפרא גדולים מעשה צדיקים יותר ממעשה שמים וארץ דאילו במעשה שמים וארץ כתיב אף ידי יסדה ארץ וימיני טפחה שמים ואילו במעשה ידיהם של צדיקים כתיב מכון לשבתך פעלת ה' מקדש אדני כוננו ידיך
By the Creation of the “Heavens and Earth”, the verse refers to My Hand and My Right (singular). However, the verse regarding building the Bais HaMikdash refers to Your hands (plural).
One can understand this matter according to the words of the Chachmei Emes (Kabalah). A hand (unnamed refers to the left hand) indicates the ability to act through natural processes. A right hand indicates the ability to act by miraculous means. As if to say that when G-d acts within natural means He uses His left hand and when He acts miraculously He uses His right hand. When G-d built the Bais HaMikdash He combined these two methods, natural and miraculous. Thus, the reference to the use of two hands indicates that HaShem combines both properties within the Bais HaMikdash.
