не говори гоп, пока не перескочишь

• НЕ ГОВОРИ ГОП, ПОКА НЕ ПЕРЕПРЫГНЕШЬ <НЕ ПЕРЕСКОЧИШЬ>

[saying]

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⇒ do not consider sth. finished until it is brought to a conclusion (said to or of a person who is too self-confident, who celebrates his success before it is ensured):

- - don't count your chickens before they are hatched;

- don't whistle <halloo> till you are out of the wood(s);

- don't speak too soon;

- there's many a slip 'twixt <betwixt, between> the cup and the lip.