Does the Shema require intention (kavanah) specifically in the first verse ('Shema Yisrael'), or throughout all three paragraphs?

PrayerShema

Synopsis

The Mechaber rules that lack of intention in the first verse of Shema means the obligation is not fulfilled; for the remainder, fulfillment is valid even without focused intention. There is a debate about whether this refers only to 'attentive intention' (focusing on the words) or also to 'obligation intention' (intent to fulfill the mitzvah).

Rishonim
Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

Discussion

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