Djeru's Resolve — ruling 1

Untapping an attacking creature doesn’t remove it from combat.

Djeru's Resolve — ruling 2

Djeru’s Resolve can target an untapped creature. Its prevention effect will still be applied.

Djeru's Resolve : règles, fonctionnement et interactions (MTG)

Djeru's Resolve is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Untap target creature. Prevent all damage that would be dealt to it this turn. Cycling (, Discard this card: Draw a card.)

How it works : Djeru's Resolve

Original English text — Wizards of the Coast / Scryfall

#1April 18, 2017· Wizards of the Coast
Untapping an attacking creature doesn’t remove it from combat.
No other card is named in this ruling.
#2April 18, 2017· Wizards of the Coast
Djeru’s Resolve can target an untapped creature. Its prevention effect will still be applied.
No other card is named in this ruling.