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The reason for the 'windows' is spelled out in Midrash Tanchuma, Naso 8:

וכן הוא אומר, הנה זה עומד אחר כתלנו משגיח מן החלונות מציץ מן החרכים (שה"ש ב ט), מה בין אצבעות של כהנים. מציץ מן החרכים, בשעה שפושטין כפיהם. לכך נאמר, כה תברכו את בני ישראל:

החרכים is read as ה חרכים, 5 apertures (ה' חרכים), thus the custom of most Kohanim to place the 2 hands together, with the thumbs touching, and the two left and right fingers of each hand paired together, with the hands otherwise stretched out.

Some Sefardim follow the Zohar: The 10 fingers correspond to the 10 distinct Sefiros. Thus, no fingers should be touching.

Some, wishing to follow both of the above customs, combine the 2. Thus, fingers 1-2 and 3-4 (that most keep together) are kept very slightly apart, with a larger gap in between 3 and 4 on each hand.

(Source: Bircas Kohanim by Rabbi Ave Gold, Artscroll 1981)

The reason for the 'windows' is spelled out in Midrash Tanchuma, Naso 8:

וכן הוא אומר, הנה זה עומד אחר כתלנו משגיח מן החלונות מציץ מן החרכים (שה"ש ב ט), מה בין אצבעות של כהנים. מציץ מן החרכים, בשעה שפושטין כפיהם. לכך נאמר, כה תברכו את בני ישראל:

החרכים is read as ה חרכים, 5 apertures, thus the custom of most Kohanim to place the 2 hands together, with the thumbs touching, and the two left and right fingers of each hand paired together, with the hands otherwise stretched out.

Some Sefardim follow the Zohar: The 10 fingers correspond to the 10 distinct Sefiros. Thus, no fingers should be touching.

Some, wishing to follow both of the above customs, combine the 2. Thus, fingers 1-2 and 3-4 (that most keep together) are kept very slightly apart, with a larger gap in between 3 and 4 on each hand.

(Source: Bircas Kohanim by Rabbi Ave Gold, Artscroll 1981)

The reason for the 'windows' is spelled out in Midrash Tanchuma, Naso 8:

וכן הוא אומר, הנה זה עומד אחר כתלנו משגיח מן החלונות מציץ מן החרכים (שה"ש ב ט), מה בין אצבעות של כהנים. מציץ מן החרכים, בשעה שפושטין כפיהם. לכך נאמר, כה תברכו את בני ישראל:

החרכים is read as 5 apertures (ה' חרכים), thus the custom of most Kohanim to place the 2 hands together, with the thumbs touching, and the two left and right fingers of each hand paired together, with the hands otherwise stretched out.

Some Sefardim follow the Zohar: The 10 fingers correspond to the 10 distinct Sefiros. Thus, no fingers should be touching.

Some, wishing to follow both of the above customs, combine the 2. Thus, fingers 1-2 and 3-4 (that most keep together) are kept very slightly apart, with a larger gap in between 3 and 4 on each hand.

(Source: Bircas Kohanim by Rabbi Ave Gold, Artscroll 1981)

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The reason for the 'windows' is spelled out in Midrash Tanchuma, Naso 8:

וכן הוא אומר, הנה זה עומד אחר כתלנו משגיח מן החלונות מציץ מן החרכים (שה"ש ב ט), מה בין אצבעות של כהנים. מציץ מן החרכים, בשעה שפושטין כפיהם. לכך נאמר, כה תברכו את בני ישראל:

החרכים is read as ה חרכים, 5 apertures, thus the custom of most Kohanim to place the 2 hands together, with the thumbs touching, and the two left and right fingers of each hand paired together, with the hands otherwise stretched out.

Some Sefardim follow the Zohar: The 10 fingers correspond to the 10 distinct Sefiros. Thus, no fingers should be touching.

Some, wishing to follow both of the above customs, combine the 2. Thus, fingers 1-2 and 3-4 (that most keep together) are kept very slightly apart, with a larger gap in between 3 and 4 on each hand.

(Source: Bircas Kohanim by Rabbi Ave Gold, Artscroll 1981)