Sheltering Word is a common Instant card from Avacyn Restored (AVR), collector number 192. Current market price: $0.22 (foil $1.70), TCGplayer market prices via Scryfall.
Target creature you control gains hexproof until end of turn. You gain life equal to that creature's toughness. (A creature with hexproof can't be the target of spells or abilities your opponents control.)