Weapon of Oath

 You call the powers of your oath to grant you power to throw weapon that normally could not be thrown without significant penalty and return to your hands for up to 1 minute. You touch a weapon that you are proficient and allows you to add the "throw" property and the "returning" property. 

Throw: You may use your strength modifier to throw a non-2 handed martial or simple weapon 20ft/60ft without penalty. The weapon deals damage as you would if you were to wield the weapons. Weapons with the versatile property may be thrown with both hands if they are free.

Returning: As a bonus action you may call back your weapon to your side. You must have a free hand to call your weapon.

Since the power is unique the caster, weapons picked up by others would not benefit from this spell.