When do Priests learn Prayer of Mending?

Rank 1 at level 40, with later ranks at 50, 60. Visit a class trainer in any capital.

Did Prayer of Mending change from Classic?

Prayer of Mending is new in WoW Forever and had no Classic 1.12 equivalent for Priests.

Rank	Level	Cost / range / cast	Effect	Classic 1.12
Rank 1	40	210 Mana · 40 yd range · Instant · 10 sec cooldown	Places a spell on the target that heals them for 172 the next time they take damage or receive non-periodic healing. When the heal occurs, Prayer of Mending jumps to a party or raid member within 20 yards. Jumps up to 5 times and lasts 30 sec after each jump. This spell can only be placed on one target at a time per caster.	new
Rank 2	50	305 Mana · 40 yd range · Instant · 10 sec cooldown	Places a spell on the target that heals them for 298 the next time they take damage or receive non-periodic healing. When the heal occurs, Prayer of Mending jumps to a party or raid member within 20 yds. Jumps up to 5 times and lasts 30 sec after each jump. This spell can only be placed on one target at a time per caster.	new
Rank 3	60	390 Mana · 40 yd range · Instant · 10 sec cooldown	Places a spell on the target that heals them for 413 the next time they take damage or receive non-periodic healing. When the heal occurs, Prayer of Mending jumps to a party or raid member within 20 yds. Jumps up to 5 times and lasts 30 sec after each jump. This spell can only be placed on one target at a time per caster.	new

Improved Healing (Holy row 4): Reduces the Mana cost of your Lesser Heal, Heal, Greater Heal, Penance, and Prayer of Mending spells by 15%.
Prayer of Mending (Holy row 7): Places a spell on the target that heals them for 172 the next time they take damage or receive non-periodic healing. When the heal occurs, Prayer of Mending jumps to a party or raid member within 20 yards. Jumps up to 5 times and lasts 30 sec after each jump. This spell can only be placed on one target at a time per caster.

Source: beta client 1.60.1.70753. Spell ID 1240827.